diff --git a/td/telegram/BotCommandScope.cpp b/td/telegram/BotCommandScope.cpp
index 74c3ac29b..6445e7ac6 100644
--- a/td/telegram/BotCommandScope.cpp
+++ b/td/telegram/BotCommandScope.cpp
@@ -100,7 +100,9 @@ telegram_api::object_ptr<telegram_api::BotCommandScope> BotCommandScope::get_inp
     const Td *td) const {
   auto input_peer =
       dialog_id_.is_valid() ? td->messages_manager_->get_input_peer(dialog_id_, AccessRights::Read) : nullptr;
-  auto input_user = user_id_.is_valid() ? td->contacts_manager_->get_input_user(user_id_) : nullptr;
+  auto input_user = td->contacts_manager_->have_input_user(user_id_)
+                        ? td->contacts_manager_->get_input_user(user_id_).move_as_ok()
+                        : nullptr;
   switch (type_) {
     case Type::Default:
       return telegram_api::make_object<telegram_api::botCommandScopeDefault>();
diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 50613e0c9..00f03f5b1 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -1431,8 +1431,8 @@ class GetExportedChatInvitesQuery final : public Td::ResultHandler {
       return on_error(Status::Error(400, "Can't access the chat"));
     }
 
-    auto input_user = td_->contacts_manager_->get_input_user(creator_user_id);
-    CHECK(input_user != nullptr);
+    auto r_input_user = td_->contacts_manager_->get_input_user(creator_user_id);
+    CHECK(r_input_user.is_ok());
 
     int32 flags = 0;
     if (!offset_invite_link.empty() || offset_date != 0) {
@@ -1442,9 +1442,9 @@ class GetExportedChatInvitesQuery final : public Td::ResultHandler {
     if (is_revoked) {
       flags |= telegram_api::messages_getExportedChatInvites::REVOKED_MASK;
     }
-    send_query(G()->net_query_creator().create(
-        telegram_api::messages_getExportedChatInvites(flags, false /*ignored*/, std::move(input_peer),
-                                                      std::move(input_user), offset_date, offset_invite_link, limit)));
+    send_query(G()->net_query_creator().create(telegram_api::messages_getExportedChatInvites(
+        flags, false /*ignored*/, std::move(input_peer), r_input_user.move_as_ok(), offset_date, offset_invite_link,
+        limit)));
   }
 
   void on_result(BufferSlice packet) final {
@@ -1548,15 +1548,15 @@ class GetChatInviteImportersQuery final : public Td::ResultHandler {
       return on_error(Status::Error(400, "Can't access the chat"));
     }
 
-    auto input_user = td_->contacts_manager_->get_input_user(offset_user_id);
-    if (input_user == nullptr) {
-      input_user = make_tl_object<telegram_api::inputUserEmpty>();
+    auto r_input_user = td_->contacts_manager_->get_input_user(offset_user_id);
+    if (r_input_user.is_error()) {
+      r_input_user = make_tl_object<telegram_api::inputUserEmpty>();
     }
 
     int32 flags = telegram_api::messages_getChatInviteImporters::LINK_MASK;
     send_query(G()->net_query_creator().create(
         telegram_api::messages_getChatInviteImporters(flags, false /*ignored*/, std::move(input_peer), invite_link,
-                                                      string(), offset_date, std::move(input_user), limit)));
+                                                      string(), offset_date, r_input_user.move_as_ok(), limit)));
   }
 
   void on_result(BufferSlice packet) final {
@@ -1619,9 +1619,9 @@ class GetChatJoinRequestsQuery final : public Td::ResultHandler {
       return on_error(Status::Error(400, "Can't access the chat"));
     }
 
-    auto input_user = td_->contacts_manager_->get_input_user(offset_user_id);
-    if (input_user == nullptr) {
-      input_user = make_tl_object<telegram_api::inputUserEmpty>();
+    auto r_input_user = td_->contacts_manager_->get_input_user(offset_user_id);
+    if (r_input_user.is_error()) {
+      r_input_user = make_tl_object<telegram_api::inputUserEmpty>();
     }
 
     int32 flags = telegram_api::messages_getChatInviteImporters::REQUESTED_MASK;
@@ -1633,7 +1633,7 @@ class GetChatJoinRequestsQuery final : public Td::ResultHandler {
     }
     send_query(G()->net_query_creator().create(
         telegram_api::messages_getChatInviteImporters(flags, false /*ignored*/, std::move(input_peer), invite_link,
-                                                      query, offset_date, std::move(input_user), limit)));
+                                                      query, offset_date, r_input_user.move_as_ok(), limit)));
   }
 
   void on_result(BufferSlice packet) final {
@@ -1696,9 +1696,9 @@ class HideChatJoinRequestQuery final : public Td::ResultHandler {
       return on_error(Status::Error(400, "Can't access the chat"));
     }
 
-    auto input_user = td_->contacts_manager_->get_input_user(user_id);
-    if (input_user == nullptr) {
-      return on_error(Status::Error(400, "Can't find user"));
+    auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+    if (r_input_user.is_error()) {
+      return on_error(r_input_user.move_as_error());
     }
 
     int32 flags = 0;
@@ -1706,7 +1706,7 @@ class HideChatJoinRequestQuery final : public Td::ResultHandler {
       flags |= telegram_api::messages_hideChatJoinRequest::APPROVED_MASK;
     }
     send_query(G()->net_query_creator().create(telegram_api::messages_hideChatJoinRequest(
-        flags, false /*ignored*/, std::move(input_peer), std::move(input_user))));
+        flags, false /*ignored*/, std::move(input_peer), r_input_user.move_as_ok())));
   }
 
   void on_result(BufferSlice packet) final {
@@ -1893,11 +1893,11 @@ class DeleteRevokedExportedChatInvitesQuery final : public Td::ResultHandler {
       return on_error(Status::Error(400, "Can't access the chat"));
     }
 
-    auto input_user = td_->contacts_manager_->get_input_user(creator_user_id);
-    CHECK(input_user != nullptr);
+    auto r_input_user = td_->contacts_manager_->get_input_user(creator_user_id);
+    CHECK(r_input_user.is_ok());
 
     send_query(G()->net_query_creator().create(
-        telegram_api::messages_deleteRevokedExportedChatInvites(std::move(input_peer), std::move(input_user))));
+        telegram_api::messages_deleteRevokedExportedChatInvites(std::move(input_peer), r_input_user.move_as_ok())));
   }
 
   void on_result(BufferSlice packet) final {
@@ -2208,10 +2208,10 @@ class CanEditChannelCreatorQuery final : public Td::ResultHandler {
   }
 
   void send() {
-    auto input_user = td_->contacts_manager_->get_input_user(td_->contacts_manager_->get_my_id());
-    CHECK(input_user != nullptr);
+    auto r_input_user = td_->contacts_manager_->get_input_user(td_->contacts_manager_->get_my_id());
+    CHECK(r_input_user.is_ok());
     send_query(G()->net_query_creator().create(telegram_api::channels_editCreator(
-        telegram_api::make_object<telegram_api::inputChannelEmpty>(), std::move(input_user),
+        telegram_api::make_object<telegram_api::inputChannelEmpty>(), r_input_user.move_as_ok(),
         make_tl_object<telegram_api::inputCheckPasswordEmpty>())));
   }
 
@@ -2246,12 +2246,12 @@ class EditChannelCreatorQuery final : public Td::ResultHandler {
     if (input_channel == nullptr) {
       return promise_.set_error(Status::Error(400, "Have no access to the chat"));
     }
-    auto input_user = td_->contacts_manager_->get_input_user(user_id);
-    if (input_user == nullptr) {
-      return promise_.set_error(Status::Error(400, "Have no access to the user"));
+    auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+    if (r_input_user.is_error()) {
+      return promise_.set_error(r_input_user.move_as_error());
     }
     send_query(G()->net_query_creator().create(telegram_api::channels_editCreator(
-        std::move(input_channel), std::move(input_user), std::move(input_check_password))));
+        std::move(input_channel), r_input_user.move_as_ok(), std::move(input_check_password))));
   }
 
   void on_result(BufferSlice packet) final {
@@ -4359,17 +4359,20 @@ void ContactsManager::SecretChat::parse(ParserT &parser) {
   }
 }
 
-tl_object_ptr<telegram_api::InputUser> ContactsManager::get_input_user(UserId user_id) const {
+Result<tl_object_ptr<telegram_api::InputUser>> ContactsManager::get_input_user(UserId user_id) const {
   if (user_id == get_my_id()) {
     return make_tl_object<telegram_api::inputUserSelf>();
   }
 
   const User *u = get_user(user_id);
-  if (u == nullptr || u->access_hash == -1 || u->is_min_access_hash) {
+  if (u == nullptr) {
+    return Status::Error(400, "User not found");
+  }
+  if (u->access_hash == -1 || u->is_min_access_hash) {
     if (td_->auth_manager_->is_bot() && user_id.is_valid()) {
       return make_tl_object<telegram_api::inputUser>(user_id.get(), 0);
     }
-    return nullptr;
+    return Status::Error(400, "Have no access to the user");
   }
 
   return make_tl_object<telegram_api::inputUser>(user_id.get(), u->access_hash);
@@ -5166,13 +5169,13 @@ void ContactsManager::add_contact(Contact contact, bool share_phone_number, Prom
   LOG(INFO) << "Add " << contact << " with share_phone_number = " << share_phone_number;
 
   auto user_id = contact.get_user_id();
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   td_->create_handler<AddContactQuery>(std::move(promise))
-      ->send(user_id, std::move(input_user), contact, share_phone_number);
+      ->send(user_id, r_input_user.move_as_ok(), contact, share_phone_number);
 }
 
 std::pair<vector<UserId>, vector<int32>> ContactsManager::import_contacts(const vector<Contact> &contacts,
@@ -5302,10 +5305,10 @@ void ContactsManager::remove_contacts(const vector<UserId> &user_ids, Promise<Un
   for (auto &user_id : user_ids) {
     const User *u = get_user(user_id);
     if (u != nullptr && u->is_contact) {
-      auto input_user = get_input_user(user_id);
-      if (input_user != nullptr) {
+      auto r_input_user = get_input_user(user_id);
+      if (r_input_user.is_ok()) {
         to_delete_user_ids.push_back(user_id);
-        input_users.push_back(std::move(input_user));
+        input_users.push_back(r_input_user.move_as_ok());
       }
     }
   }
@@ -5652,14 +5655,14 @@ void ContactsManager::share_phone_number(UserId user_id, Promise<Unit> &&promise
   }
 
   LOG(INFO) << "Share phone number with " << user_id;
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   td_->messages_manager_->hide_dialog_action_bar(DialogId(user_id));
 
-  td_->create_handler<AcceptContactQuery>(std::move(promise))->send(user_id, std::move(input_user));
+  td_->create_handler<AcceptContactQuery>(std::move(promise))->send(user_id, r_input_user.move_as_ok());
 }
 
 void ContactsManager::search_dialogs_nearby(const Location &location,
@@ -6773,13 +6776,13 @@ void ContactsManager::add_chat_participant(ChatId chat_id, UserId user_id, int32
   }
   // TODO upper bound on forward_limit
 
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   // TODO invoke after
-  td_->create_handler<AddChatUserQuery>(std::move(promise))->send(chat_id, std::move(input_user), forward_limit);
+  td_->create_handler<AddChatUserQuery>(std::move(promise))->send(chat_id, r_input_user.move_as_ok(), forward_limit);
 }
 
 void ContactsManager::add_channel_participant(ChannelId channel_id, UserId user_id,
@@ -6792,9 +6795,9 @@ void ContactsManager::add_channel_participant(ChannelId channel_id, UserId user_
   if (c == nullptr) {
     return promise.set_error(Status::Error(400, "Chat info not found"));
   }
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   if (user_id == get_my_id()) {
@@ -6814,7 +6817,7 @@ void ContactsManager::add_channel_participant(ChannelId channel_id, UserId user_
 
   speculative_add_channel_user(channel_id, user_id, DialogParticipantStatus::Member(), old_status);
   vector<tl_object_ptr<telegram_api::InputUser>> input_users;
-  input_users.push_back(std::move(input_user));
+  input_users.push_back(r_input_user.move_as_ok());
   td_->create_handler<InviteToChannelQuery>(std::move(promise))->send(channel_id, std::move(input_users));
 }
 
@@ -6835,16 +6838,16 @@ void ContactsManager::add_channel_participants(ChannelId channel_id, const vecto
 
   vector<tl_object_ptr<telegram_api::InputUser>> input_users;
   for (auto user_id : user_ids) {
-    auto input_user = get_input_user(user_id);
-    if (input_user == nullptr) {
-      return promise.set_error(Status::Error(400, "User not found"));
+    auto r_input_user = get_input_user(user_id);
+    if (r_input_user.is_error()) {
+      return promise.set_error(r_input_user.move_as_error());
     }
 
     if (user_id == get_my_id()) {
       // can't invite self
       continue;
     }
-    input_users.push_back(std::move(input_user));
+    input_users.push_back(r_input_user.move_as_ok());
   }
 
   if (input_users.empty()) {
@@ -6921,9 +6924,10 @@ void ContactsManager::set_channel_participant_status_impl(ChannelId channel_id,
     }
     if (status.is_member() == old_status.is_member()) {
       // change rank and is_anonymous
-      auto input_user = get_input_user(get_my_id());
-      CHECK(input_user != nullptr);
-      td_->create_handler<EditChannelAdminQuery>(std::move(promise))->send(channel_id, std::move(input_user), status);
+      auto r_input_user = get_input_user(get_my_id());
+      CHECK(r_input_user.is_ok());
+      td_->create_handler<EditChannelAdminQuery>(std::move(promise))
+          ->send(channel_id, r_input_user.move_as_ok(), status);
       return;
     }
     if (status.is_member()) {
@@ -7002,13 +7006,13 @@ void ContactsManager::promote_channel_participant(ChannelId channel_id, UserId u
     CHECK(!status.is_creator());
   }
 
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   speculative_add_channel_user(channel_id, user_id, status, old_status);
-  td_->create_handler<EditChannelAdminQuery>(std::move(promise))->send(channel_id, std::move(input_user), status);
+  td_->create_handler<EditChannelAdminQuery>(std::move(promise))->send(channel_id, r_input_user.move_as_ok(), status);
 }
 
 void ContactsManager::set_chat_participant_status(ChatId chat_id, UserId user_id, DialogParticipantStatus status,
@@ -7080,12 +7084,13 @@ void ContactsManager::set_chat_participant_status(ChatId chat_id, UserId user_id
 
 void ContactsManager::send_edit_chat_admin_query(ChatId chat_id, UserId user_id, bool is_administrator,
                                                  Promise<Unit> &&promise) {
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
-  td_->create_handler<EditChatAdminQuery>(std::move(promise))->send(chat_id, std::move(input_user), is_administrator);
+  td_->create_handler<EditChatAdminQuery>(std::move(promise))
+      ->send(chat_id, r_input_user.move_as_ok(), is_administrator);
 }
 
 void ContactsManager::can_transfer_ownership(Promise<CanTransferOwnershipResult> &&promise) {
@@ -7472,13 +7477,14 @@ void ContactsManager::delete_chat_participant(ChatId chat_id, UserId user_id, bo
       }
     }
   }
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   // TODO invoke after
-  td_->create_handler<DeleteChatUserQuery>(std::move(promise))->send(chat_id, std::move(input_user), revoke_messages);
+  td_->create_handler<DeleteChatUserQuery>(std::move(promise))
+      ->send(chat_id, r_input_user.move_as_ok(), revoke_messages);
 }
 
 void ContactsManager::restrict_channel_participant(ChannelId channel_id, DialogId participant_dialog_id,
@@ -13956,14 +13962,14 @@ bool ContactsManager::get_user(UserId user_id, int left_tries, Promise<Unit> &&p
                          std::move(promise));
       return false;
     }
-    auto input_user = get_input_user(user_id);
-    if (left_tries == 1 || input_user == nullptr) {
-      promise.set_error(Status::Error(400, "User not found"));
+    auto r_input_user = get_input_user(user_id);
+    if (left_tries == 1 || r_input_user.is_error()) {
+      promise.set_error(r_input_user.move_as_error());
       return false;
     }
 
     vector<tl_object_ptr<telegram_api::InputUser>> users;
-    users.push_back(std::move(input_user));
+    users.push_back(r_input_user.move_as_ok());
     td_->create_handler<GetUsersQuery>(std::move(promise))->send(std::move(users));
     return false;
   }
@@ -14014,14 +14020,14 @@ void ContactsManager::reload_user(UserId user_id, Promise<Unit> &&promise) {
   }
 
   have_user_force(user_id);
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User info not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   // there is no much reason to combine different requests into one request
   vector<tl_object_ptr<telegram_api::InputUser>> users;
-  users.push_back(std::move(input_user));
+  users.push_back(r_input_user.move_as_ok());
   td_->create_handler<GetUsersQuery>(std::move(promise))->send(std::move(users));
 }
 
@@ -14033,30 +14039,30 @@ void ContactsManager::load_user_full(UserId user_id, bool force, Promise<Unit> &
 
   auto user_full = get_user_full_force(user_id);
   if (user_full == nullptr) {
-    auto input_user = get_input_user(user_id);
-    if (input_user == nullptr) {
-      return promise.set_error(Status::Error(400, "Can't get info about inaccessible user"));
+    auto r_input_user = get_input_user(user_id);
+    if (r_input_user.is_error()) {
+      return promise.set_error(r_input_user.move_as_error());
     }
 
-    return send_get_user_full_query(user_id, std::move(input_user), std::move(promise), source);
+    return send_get_user_full_query(user_id, r_input_user.move_as_ok(), std::move(promise), source);
   }
   if (user_full->is_expired()) {
-    auto input_user = get_input_user(user_id);
-    CHECK(input_user != nullptr);
+    auto r_input_user = get_input_user(user_id);
+    CHECK(r_input_user.is_ok());
     if (td_->auth_manager_->is_bot() && !force) {
-      return send_get_user_full_query(user_id, std::move(input_user), std::move(promise), "load expired user_full");
+      return send_get_user_full_query(user_id, r_input_user.move_as_ok(), std::move(promise), "load expired user_full");
     }
 
-    send_get_user_full_query(user_id, std::move(input_user), Auto(), "load expired user_full");
+    send_get_user_full_query(user_id, r_input_user.move_as_ok(), Auto(), "load expired user_full");
   }
 
   promise.set_value(Unit());
 }
 
 void ContactsManager::reload_user_full(UserId user_id) {
-  auto input_user = get_input_user(user_id);
-  if (input_user != nullptr) {
-    send_get_user_full_query(user_id, std::move(input_user), Auto(), "reload_user_full");
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_ok()) {
+    send_get_user_full_query(user_id, r_input_user.move_as_ok(), Auto(), "reload_user_full");
   }
 }
 
@@ -14089,9 +14095,9 @@ std::pair<int32, vector<const Photo *>> ContactsManager::get_user_profile_photos
     limit = MAX_GET_PROFILE_PHOTOS;
   }
 
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    promise.set_error(Status::Error(400, "User not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    promise.set_error(r_input_user.move_as_error());
     return result;
   }
 
@@ -14141,20 +14147,22 @@ std::pair<int32, vector<const Photo *>> ContactsManager::get_user_profile_photos
     limit = MAX_GET_PROFILE_PHOTOS / 5;  // make limit reasonable
   }
 
-  td_->create_handler<GetUserPhotosQuery>(std::move(promise))->send(user_id, std::move(input_user), offset, limit, 0);
+  td_->create_handler<GetUserPhotosQuery>(std::move(promise))
+      ->send(user_id, r_input_user.move_as_ok(), offset, limit, 0);
   return result;
 }
 
 void ContactsManager::reload_user_profile_photo(UserId user_id, int64 photo_id, Promise<Unit> &&promise) {
   get_user_force(user_id);
-  auto input_user = get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User info not found"));
+  auto r_input_user = get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   // this request will be needed only to download the photo,
   // so there is no reason to combine different requests for a photo into one request
-  td_->create_handler<GetUserPhotosQuery>(std::move(promise))->send(user_id, std::move(input_user), -1, 1, photo_id);
+  td_->create_handler<GetUserPhotosQuery>(std::move(promise))
+      ->send(user_id, r_input_user.move_as_ok(), -1, 1, photo_id);
 }
 
 FileSourceId ContactsManager::get_user_profile_photo_file_source_id(UserId user_id, int64 photo_id) {
@@ -15154,9 +15162,9 @@ void ContactsManager::get_channel_participant(ChannelId channel_id, DialogId par
                                               Promise<DialogParticipant> &&promise) {
   LOG(INFO) << "Trying to get " << participant_dialog_id << " as member of " << channel_id;
 
-  auto input_peer = td_->messages_manager_->get_input_peer(participant_dialog_id, AccessRights::Read);
+  auto input_peer = td_->messages_manager_->get_input_peer(participant_dialog_id, AccessRights::Know);
   if (input_peer == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
+    return promise.set_error(Status::Error(400, "Member not found"));
   }
 
   if (have_channel_participant_cache(channel_id)) {
diff --git a/td/telegram/ContactsManager.h b/td/telegram/ContactsManager.h
index 4b589aafb..fc54082f5 100644
--- a/td/telegram/ContactsManager.h
+++ b/td/telegram/ContactsManager.h
@@ -72,7 +72,7 @@ class ContactsManager final : public Actor {
   static ChatId get_chat_id(const tl_object_ptr<telegram_api::Chat> &chat);
   static ChannelId get_channel_id(const tl_object_ptr<telegram_api::Chat> &chat);
 
-  tl_object_ptr<telegram_api::InputUser> get_input_user(UserId user_id) const;
+  Result<tl_object_ptr<telegram_api::InputUser>> get_input_user(UserId user_id) const;
   bool have_input_user(UserId user_id) const;
 
   // TODO get_input_chat ???
diff --git a/td/telegram/DialogEventLog.cpp b/td/telegram/DialogEventLog.cpp
index e6b96efd1..bc4be6089 100644
--- a/td/telegram/DialogEventLog.cpp
+++ b/td/telegram/DialogEventLog.cpp
@@ -488,11 +488,11 @@ void get_dialog_event_log(Td *td, DialogId dialog_id, const string &query, int64
 
   vector<tl_object_ptr<telegram_api::InputUser>> input_users;
   for (auto user_id : user_ids) {
-    auto input_user = td->contacts_manager_->get_input_user(user_id);
-    if (input_user == nullptr) {
-      return promise.set_error(Status::Error(400, "User not found"));
+    auto r_input_user = td->contacts_manager_->get_input_user(user_id);
+    if (r_input_user.is_error()) {
+      return promise.set_error(r_input_user.move_as_error());
     }
-    input_users.push_back(std::move(input_user));
+    input_users.push_back(r_input_user.move_as_ok());
   }
 
   td->create_handler<GetChannelAdminLogQuery>(std::move(promise))
diff --git a/td/telegram/Game.cpp b/td/telegram/Game.cpp
index 436c7fdc2..a5467597e 100644
--- a/td/telegram/Game.cpp
+++ b/td/telegram/Game.cpp
@@ -90,10 +90,10 @@ bool Game::has_input_media() const {
 }
 
 tl_object_ptr<telegram_api::inputMediaGame> Game::get_input_media_game(const Td *td) const {
-  auto input_user = td->contacts_manager_->get_input_user(bot_user_id_);
-  CHECK(input_user != nullptr);
+  auto r_input_user = td->contacts_manager_->get_input_user(bot_user_id_);
+  CHECK(r_input_user.is_ok());
   return make_tl_object<telegram_api::inputMediaGame>(
-      make_tl_object<telegram_api::inputGameShortName>(std::move(input_user), short_name_));
+      make_tl_object<telegram_api::inputGameShortName>(r_input_user.move_as_ok(), short_name_));
 }
 
 bool operator==(const Game &lhs, const Game &rhs) {
diff --git a/td/telegram/GameManager.cpp b/td/telegram/GameManager.cpp
index 81bbfb482..648397930 100644
--- a/td/telegram/GameManager.cpp
+++ b/td/telegram/GameManager.cpp
@@ -217,9 +217,9 @@ void GameManager::set_game_score(FullMessageId full_message_id, bool edit_messag
     return promise.set_error(Status::Error(400, "Can't access the chat"));
   }
 
-  auto input_user = td_->contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "Invalid user identifier specified"));
+  auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   if (!td_->messages_manager_->can_set_game_score(full_message_id)) {
@@ -234,7 +234,7 @@ void GameManager::set_game_score(FullMessageId full_message_id, bool edit_messag
         send_closure(actor_id, &GameManager::on_set_game_score, full_message_id, std::move(promise));
       });
   send_closure(td_->create_net_actor<SetGameScoreActor>(std::move(query_promise)), &SetGameScoreActor::send, dialog_id,
-               full_message_id.get_message_id(), edit_message, std::move(input_user), score, force,
+               full_message_id.get_message_id(), edit_message, r_input_user.move_as_ok(), score, force,
                MessagesManager::get_sequence_dispatcher_id(dialog_id, MessageContentType::None));
 }
 
@@ -252,13 +252,13 @@ void GameManager::set_inline_game_score(const string &inline_message_id, bool ed
     return promise.set_error(Status::Error(400, "Invalid inline message identifier specified"));
   }
 
-  auto input_user = td_->contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "Wrong user identifier specified"));
+  auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   td_->create_handler<SetInlineGameScoreQuery>(std::move(promise))
-      ->send(std::move(input_bot_inline_message_id), edit_message, std::move(input_user), score, force);
+      ->send(std::move(input_bot_inline_message_id), edit_message, r_input_user.move_as_ok(), score, force);
 }
 
 void GameManager::get_game_high_scores(FullMessageId full_message_id, UserId user_id,
@@ -278,12 +278,13 @@ void GameManager::get_game_high_scores(FullMessageId full_message_id, UserId use
     return promise.set_error(Status::Error(400, "Wrong message identifier specified"));
   }
 
-  auto input_user = td_->contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "Wrong user identifier specified"));
+  auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
-  td_->create_handler<GetGameHighScoresQuery>(std::move(promise))->send(dialog_id, message_id, std::move(input_user));
+  td_->create_handler<GetGameHighScoresQuery>(std::move(promise))
+      ->send(dialog_id, message_id, r_input_user.move_as_ok());
 }
 
 void GameManager::get_inline_game_high_scores(const string &inline_message_id, UserId user_id,
@@ -295,13 +296,13 @@ void GameManager::get_inline_game_high_scores(const string &inline_message_id, U
     return promise.set_error(Status::Error(400, "Invalid inline message identifier specified"));
   }
 
-  auto input_user = td_->contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "Wrong user identifier specified"));
+  auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
 
   td_->create_handler<GetInlineGameHighScoresQuery>(std::move(promise))
-      ->send(std::move(input_bot_inline_message_id), std::move(input_user));
+      ->send(std::move(input_bot_inline_message_id), r_input_user.move_as_ok());
 }
 
 td_api::object_ptr<td_api::gameHighScores> GameManager::get_game_high_scores_object(
diff --git a/td/telegram/GroupCallManager.cpp b/td/telegram/GroupCallManager.cpp
index 9beec6c29..8d27acb30 100644
--- a/td/telegram/GroupCallManager.cpp
+++ b/td/telegram/GroupCallManager.cpp
@@ -3329,16 +3329,16 @@ void GroupCallManager::invite_group_call_participants(GroupCallId group_call_id,
   vector<tl_object_ptr<telegram_api::InputUser>> input_users;
   auto my_user_id = td_->contacts_manager_->get_my_id();
   for (auto user_id : user_ids) {
-    auto input_user = td_->contacts_manager_->get_input_user(user_id);
-    if (input_user == nullptr) {
-      return promise.set_error(Status::Error(400, "User not found"));
+    auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+    if (r_input_user.is_error()) {
+      return promise.set_error(r_input_user.move_as_error());
     }
 
     if (user_id == my_user_id) {
       // can't invite self
       continue;
     }
-    input_users.push_back(std::move(input_user));
+    input_users.push_back(r_input_user.move_as_ok());
   }
 
   if (input_users.empty()) {
diff --git a/td/telegram/InlineQueriesManager.cpp b/td/telegram/InlineQueriesManager.cpp
index a74f2c824..575cd5d60 100644
--- a/td/telegram/InlineQueriesManager.cpp
+++ b/td/telegram/InlineQueriesManager.cpp
@@ -876,17 +876,17 @@ void InlineQueriesManager::loop() {
   auto now = Time::now();
   if (now >= next_inline_query_time_) {
     LOG(INFO) << "Send inline query " << pending_inline_query_->query_hash;
-    auto bot_input_user = td_->contacts_manager_->get_input_user(pending_inline_query_->bot_user_id);
-    if (bot_input_user != nullptr) {
+    auto r_bot_input_user = td_->contacts_manager_->get_input_user(pending_inline_query_->bot_user_id);
+    if (r_bot_input_user.is_ok()) {
       if (!sent_query_.empty()) {
         LOG(INFO) << "Cancel inline query request";
         cancel_query(sent_query_);
       }
-      sent_query_ =
-          td_->create_handler<GetInlineBotResultsQuery>(std::move(pending_inline_query_->promise))
-              ->send(pending_inline_query_->bot_user_id, pending_inline_query_->dialog_id, std::move(bot_input_user),
-                     std::move(pending_inline_query_->input_peer), pending_inline_query_->user_location,
-                     pending_inline_query_->query, pending_inline_query_->offset, pending_inline_query_->query_hash);
+      sent_query_ = td_->create_handler<GetInlineBotResultsQuery>(std::move(pending_inline_query_->promise))
+                        ->send(pending_inline_query_->bot_user_id, pending_inline_query_->dialog_id,
+                               r_bot_input_user.move_as_ok(), std::move(pending_inline_query_->input_peer),
+                               pending_inline_query_->user_location, pending_inline_query_->query,
+                               pending_inline_query_->offset, pending_inline_query_->query_hash);
 
       next_inline_query_time_ = now + INLINE_QUERY_DELAY_MS * 1e-3;
     }
diff --git a/td/telegram/MessageEntity.cpp b/td/telegram/MessageEntity.cpp
index af43bad42..c6c274ae3 100644
--- a/td/telegram/MessageEntity.cpp
+++ b/td/telegram/MessageEntity.cpp
@@ -4171,10 +4171,10 @@ vector<tl_object_ptr<telegram_api::MessageEntity>> get_input_message_entities(co
             make_tl_object<telegram_api::messageEntityTextUrl>(entity.offset, entity.length, entity.argument));
         break;
       case MessageEntity::Type::MentionName: {
-        auto input_user = contacts_manager->get_input_user(entity.user_id);
-        LOG_CHECK(input_user != nullptr) << source;
+        auto r_input_user = contacts_manager->get_input_user(entity.user_id);
+        LOG_CHECK(r_input_user.is_ok()) << source << ' ' << r_input_user.error();
         result.push_back(make_tl_object<telegram_api::inputMessageEntityMentionName>(entity.offset, entity.length,
-                                                                                     std::move(input_user)));
+                                                                                     r_input_user.move_as_ok()));
         break;
       }
       default:
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index d9648170e..ffb47bd5c 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -837,11 +837,11 @@ class GetCommonDialogsQuery final : public Td::ResultHandler {
     user_id_ = user_id;
     offset_chat_id_ = offset_chat_id;
 
-    auto input_user = td_->contacts_manager_->get_input_user(user_id);
-    CHECK(input_user != nullptr);
+    auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+    CHECK(r_input_user.is_ok());
 
     send_query(G()->net_query_creator().create(
-        telegram_api::messages_getCommonChats(std::move(input_user), offset_chat_id, limit)));
+        telegram_api::messages_getCommonChats(r_input_user.move_as_ok(), offset_chat_id, limit)));
   }
 
   void on_result(BufferSlice packet) final {
@@ -19661,12 +19661,12 @@ DialogId MessagesManager::create_new_group_chat(const vector<UserId> &user_ids,
 
   vector<tl_object_ptr<telegram_api::InputUser>> input_users;
   for (auto user_id : user_ids) {
-    auto input_user = td_->contacts_manager_->get_input_user(user_id);
-    if (input_user == nullptr) {
-      promise.set_error(Status::Error(400, "User not found"));
+    auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+    if (r_input_user.is_error()) {
+      promise.set_error(r_input_user.move_as_error());
       return DialogId();
     }
-    input_users.push_back(std::move(input_user));
+    input_users.push_back(r_input_user.move_as_ok());
   }
 
   do {
@@ -19720,11 +19720,14 @@ DialogId MessagesManager::create_new_channel_chat(const string &title, bool is_m
 }
 
 void MessagesManager::create_new_secret_chat(UserId user_id, Promise<SecretChatId> &&promise) {
-  auto user_base = td_->contacts_manager_->get_input_user(user_id);
-  if (user_base == nullptr || user_base->get_id() != telegram_api::inputUser::ID) {
-    return promise.set_error(Status::Error(400, "User not found"));
+  auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return promise.set_error(r_input_user.move_as_error());
   }
-  auto user = move_tl_object_as<telegram_api::inputUser>(user_base);
+  if (r_input_user.ok()->get_id() != telegram_api::inputUser::ID) {
+    return promise.set_error(Status::Error(400, "Can't create secret chat with self"));
+  }
+  auto user = static_cast<const telegram_api::inputUser *>(r_input_user.ok().get());
 
   send_closure(G()->secret_chats_manager(), &SecretChatsManager::create_chat, UserId(user->user_id_),
                user->access_hash_, std::move(promise));
@@ -25276,12 +25279,12 @@ void MessagesManager::do_send_bot_start_message(UserId bot_user_id, DialogId dia
   if (input_peer == nullptr) {
     return on_send_message_fail(random_id, Status::Error(400, "Have no info about the chat"));
   }
-  auto bot_input_user = td_->contacts_manager_->get_input_user(bot_user_id);
-  if (bot_input_user == nullptr) {
-    return on_send_message_fail(random_id, Status::Error(400, "Have no info about the bot"));
+  auto r_bot_input_user = td_->contacts_manager_->get_input_user(bot_user_id);
+  if (r_bot_input_user.is_error()) {
+    return on_send_message_fail(random_id, r_bot_input_user.move_as_error());
   }
 
-  m->send_query_ref = td_->create_handler<StartBotQuery>()->send(std::move(bot_input_user), dialog_id,
+  m->send_query_ref = td_->create_handler<StartBotQuery>()->send(r_bot_input_user.move_as_ok(), dialog_id,
                                                                  std::move(input_peer), parameter, random_id);
 }
 
diff --git a/td/telegram/PrivacyManager.cpp b/td/telegram/PrivacyManager.cpp
index 6355fba9d..c8d8f0241 100644
--- a/td/telegram/PrivacyManager.cpp
+++ b/td/telegram/PrivacyManager.cpp
@@ -318,9 +318,9 @@ Result<PrivacyManager::UserPrivacySettingRule> PrivacyManager::UserPrivacySettin
 vector<tl_object_ptr<telegram_api::InputUser>> PrivacyManager::UserPrivacySettingRule::get_input_users() const {
   vector<tl_object_ptr<telegram_api::InputUser>> result;
   for (auto user_id : user_ids_) {
-    auto input_user = G()->td().get_actor_unsafe()->contacts_manager_->get_input_user(user_id);
-    if (input_user != nullptr) {
-      result.push_back(std::move(input_user));
+    auto r_input_user = G()->td().get_actor_unsafe()->contacts_manager_->get_input_user(user_id);
+    if (r_input_user.is_ok()) {
+      result.push_back(r_input_user.move_as_ok());
     } else {
       LOG(ERROR) << "Have no access to " << user_id;
     }
diff --git a/td/telegram/ReplyMarkup.cpp b/td/telegram/ReplyMarkup.cpp
index b7d3cb441..83d06c5f2 100644
--- a/td/telegram/ReplyMarkup.cpp
+++ b/td/telegram/ReplyMarkup.cpp
@@ -700,25 +700,26 @@ static tl_object_ptr<telegram_api::KeyboardButton> get_inline_keyboard_button(
       if (!keyboard_button.forward_text.empty()) {
         flags |= telegram_api::inputKeyboardButtonUrlAuth::FWD_TEXT_MASK;
       }
-      auto input_user = G()->td().get_actor_unsafe()->contacts_manager_->get_input_user(UserId(bot_user_id));
-      if (input_user == nullptr) {
-        LOG(ERROR) << "Failed to get InputUser for " << bot_user_id;
+      auto r_input_user = G()->td().get_actor_unsafe()->contacts_manager_->get_input_user(UserId(bot_user_id));
+      if (r_input_user.is_error()) {
+        LOG(ERROR) << "Failed to get InputUser for " << bot_user_id << ": " << r_input_user.error();
         return make_tl_object<telegram_api::keyboardButtonUrl>(keyboard_button.text, keyboard_button.data);
       }
       return make_tl_object<telegram_api::inputKeyboardButtonUrlAuth>(flags, false /*ignored*/, keyboard_button.text,
                                                                       keyboard_button.forward_text,
-                                                                      keyboard_button.data, std::move(input_user));
+                                                                      keyboard_button.data, r_input_user.move_as_ok());
     }
     case InlineKeyboardButton::Type::CallbackWithPassword:
       UNREACHABLE();
       break;
     case InlineKeyboardButton::Type::User: {
-      auto input_user = G()->td().get_actor_unsafe()->contacts_manager_->get_input_user(keyboard_button.user_id);
-      if (input_user == nullptr) {
-        LOG(ERROR) << "Failed to get InputUser for " << keyboard_button.user_id;
-        input_user = make_tl_object<telegram_api::inputUserEmpty>();
+      auto r_input_user = G()->td().get_actor_unsafe()->contacts_manager_->get_input_user(keyboard_button.user_id);
+      if (r_input_user.is_error()) {
+        LOG(ERROR) << "Failed to get InputUser for " << keyboard_button.user_id << ": " << r_input_user.error();
+        r_input_user = make_tl_object<telegram_api::inputUserEmpty>();
       }
-      return make_tl_object<telegram_api::inputKeyboardButtonUserProfile>(keyboard_button.text, std::move(input_user));
+      return make_tl_object<telegram_api::inputKeyboardButtonUserProfile>(keyboard_button.text,
+                                                                          r_input_user.move_as_ok());
     }
     default:
       UNREACHABLE();
diff --git a/td/telegram/StickersManager.cpp b/td/telegram/StickersManager.cpp
index 0080bee2c..5fd9e4d7a 100644
--- a/td/telegram/StickersManager.cpp
+++ b/td/telegram/StickersManager.cpp
@@ -5453,15 +5453,9 @@ FileId StickersManager::upload_sticker_file(UserId user_id, tl_object_ptr<td_api
     user_id = td_->contacts_manager_->get_my_id();
   }
 
-  auto input_user = td_->contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    promise.set_error(Status::Error(400, "User not found"));
-    return FileId();
-  }
-  DialogId dialog_id(user_id);
-  auto input_peer = td_->messages_manager_->get_input_peer(dialog_id, AccessRights::Write);
-  if (input_peer == nullptr) {
-    promise.set_error(Status::Error(400, "Have no access to the user"));
+  auto r_input_user = td_->contacts_manager_->get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    promise.set_error(r_input_user.move_as_error());
     return FileId();
   }
 
@@ -5579,15 +5573,8 @@ void StickersManager::create_new_sticker_set(UserId user_id, string &title, stri
   if (!is_bot) {
     user_id = td_->contacts_manager_->get_my_id();
   }
-  auto input_user = td_->contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
-  }
-  DialogId dialog_id(user_id);
-  auto input_peer = td_->messages_manager_->get_input_peer(dialog_id, AccessRights::Write);
-  if (input_peer == nullptr) {
-    return promise.set_error(Status::Error(400, "Have no access to the user"));
-  }
+
+  TRY_RESULT_PROMISE(promise, input_user, td_->contacts_manager_->get_input_user(user_id));
 
   title = strip_empty_characters(title, MAX_STICKER_SET_TITLE_LENGTH);
   if (title.empty()) {
@@ -5804,10 +5791,8 @@ void StickersManager::on_new_stickers_uploaded(int64 random_id, Result<Unit> res
 
   CHECK(pending_new_sticker_set->upload_files_multipromise.promise_count() == 0);
 
-  auto input_user = td_->contacts_manager_->get_input_user(pending_new_sticker_set->user_id);
-  if (input_user == nullptr) {
-    return pending_new_sticker_set->promise.set_error(Status::Error(400, "User not found"));
-  }
+  auto &promise = pending_new_sticker_set->promise;
+  TRY_RESULT_PROMISE(promise, input_user, td_->contacts_manager_->get_input_user(pending_new_sticker_set->user_id));
 
   bool is_masks = pending_new_sticker_set->is_masks;
   bool is_animated = pending_new_sticker_set->is_animated;
@@ -5827,15 +5812,7 @@ void StickersManager::on_new_stickers_uploaded(int64 random_id, Result<Unit> res
 
 void StickersManager::add_sticker_to_set(UserId user_id, string &short_name,
                                          tl_object_ptr<td_api::InputSticker> &&sticker, Promise<Unit> &&promise) {
-  auto input_user = td_->contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
-  }
-  DialogId dialog_id(user_id);
-  auto input_peer = td_->messages_manager_->get_input_peer(dialog_id, AccessRights::Write);
-  if (input_peer == nullptr) {
-    return promise.set_error(Status::Error(400, "Have no access to the user"));
-  }
+  TRY_RESULT_PROMISE(promise, input_user, td_->contacts_manager_->get_input_user(user_id));
 
   short_name = strip_empty_characters(short_name, MAX_STICKER_SET_SHORT_NAME_LENGTH);
   if (short_name.empty()) {
@@ -5896,15 +5873,7 @@ void StickersManager::on_added_sticker_uploaded(int64 random_id, Result<Unit> re
 
 void StickersManager::set_sticker_set_thumbnail(UserId user_id, string &short_name,
                                                 tl_object_ptr<td_api::InputFile> &&thumbnail, Promise<Unit> &&promise) {
-  auto input_user = td_->contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    return promise.set_error(Status::Error(400, "User not found"));
-  }
-  DialogId dialog_id(user_id);
-  auto input_peer = td_->messages_manager_->get_input_peer(dialog_id, AccessRights::Write);
-  if (input_peer == nullptr) {
-    return promise.set_error(Status::Error(400, "Have no access to the user"));
-  }
+  TRY_RESULT_PROMISE(promise, input_user, td_->contacts_manager_->get_input_user(user_id));
 
   short_name = clean_username(strip_empty_characters(short_name, MAX_STICKER_SET_SHORT_NAME_LENGTH));
   if (short_name.empty()) {
diff --git a/td/telegram/Td.cpp b/td/telegram/Td.cpp
index da9c01fe0..7bc1d69e6 100644
--- a/td/telegram/Td.cpp
+++ b/td/telegram/Td.cpp
@@ -5606,9 +5606,9 @@ void Td::on_request(uint64 id, const td_api::createCall &request) {
   }
 
   UserId user_id(request.user_id_);
-  auto input_user = contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    return send_error_raw(id, 400, "User not found");
+  auto r_input_user = contacts_manager_->get_input_user(user_id);
+  if (r_input_user.is_error()) {
+    return send_error_raw(id, r_input_user.error().code(), r_input_user.error().message());
   }
 
   if (!G()->shared_config().get_option_boolean("calls_enabled")) {
@@ -5623,7 +5623,7 @@ void Td::on_request(uint64 id, const td_api::createCall &request) {
       promise.set_value(result.ok().get_call_id_object());
     }
   });
-  send_closure(G()->call_manager(), &CallManager::create_call, user_id, std::move(input_user),
+  send_closure(G()->call_manager(), &CallManager::create_call, user_id, r_input_user.move_as_ok(),
                CallProtocol(*request.protocol_), request.is_video_, std::move(query_promise));
 }
 
@@ -7317,13 +7317,12 @@ void Td::on_request(uint64 id, const td_api::deletePassportElement &request) {
 
 void Td::on_request(uint64 id, td_api::setPassportElementErrors &request) {
   CHECK_IS_BOT();
-  UserId user_id(request.user_id_);
-  auto input_user = contacts_manager_->get_input_user(user_id);
-  if (input_user == nullptr) {
-    return send_error_raw(id, 400, "User not found");
+  auto r_input_user = contacts_manager_->get_input_user(UserId(request.user_id_));
+  if (r_input_user.is_error()) {
+    return send_error_raw(id, r_input_user.error().code(), r_input_user.error().message());
   }
   CREATE_OK_REQUEST_PROMISE();
-  send_closure(secure_manager_, &SecureManager::set_secure_value_errors, this, std::move(input_user),
+  send_closure(secure_manager_, &SecureManager::set_secure_value_errors, this, r_input_user.move_as_ok(),
                std::move(request.errors_), std::move(promise));
 }