diff --git a/td/telegram/DialogParticipant.h b/td/telegram/DialogParticipant.h
index b8c8d858f..c066c2852 100644
--- a/td/telegram/DialogParticipant.h
+++ b/td/telegram/DialogParticipant.h
@@ -348,6 +348,12 @@ class DialogParticipantStatus {
   // forcely returns a restricted or banned
   DialogParticipantStatus(bool is_member, tl_object_ptr<telegram_api::chatBannedRights> &&banned_rights);
 
+  bool has_all_administrator_rights(AdministratorRights administrator_rights) const {
+    auto flags = administrator_rights.flags_ &
+                 (AdministratorRights::ALL_ADMINISTRATOR_RIGHTS | AdministratorRights::IS_ANONYMOUS);
+    return (get_administrator_rights().flags_ & flags) == flags;
+  }
+
   RestrictedRights get_effective_restricted_rights() const;
 
   DialogParticipantStatus apply_restrictions(RestrictedRights default_restrictions, bool is_bot) const;
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index 53ac24887..54972f5ad 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -29896,7 +29896,13 @@ void MessagesManager::share_dialog_with_bot(FullMessageId full_message_id, int32
   }
   CHECK(m->message_id.is_valid() && m->message_id.is_server());
   if (shared_dialog_id.get_type() != DialogType::User) {
-    get_dialog_force(shared_dialog_id, "share_dialog_with_bot");
+    if (!have_dialog_force(shared_dialog_id, "share_dialog_with_bot")) {
+      return promise.set_error(Status::Error(400, "Shared chat not found"));
+    }
+  } else {
+    if (!td_->contacts_manager_->have_user(shared_dialog_id.get_user_id())) {
+      return promise.set_error(Status::Error(400, "Shared user not found"));
+    }
   }
   TRY_STATUS_PROMISE(promise, m->reply_markup->check_shared_dialog(td_, button_id, shared_dialog_id));
 
diff --git a/td/telegram/ReplyMarkup.cpp b/td/telegram/ReplyMarkup.cpp
index 6978a31e8..9a3ae0621 100644
--- a/td/telegram/ReplyMarkup.cpp
+++ b/td/telegram/ReplyMarkup.cpp
@@ -1048,8 +1048,14 @@ tl_object_ptr<td_api::ReplyMarkup> ReplyMarkup::get_reply_markup_object(Contacts
 }
 
 Status ReplyMarkup::check_shared_dialog(Td *td, int32 button_id, DialogId dialog_id) const {
-  // TODO
-  return Status::OK();
+  for (auto &row : keyboard) {
+    for (auto &button : row) {
+      if (button.requested_dialog_type != nullptr && button.requested_dialog_type->get_button_id() == button_id) {
+        return button.requested_dialog_type->check_shared_dialog(td, dialog_id);
+      }
+    }
+  }
+  return Status::Error(400, "Button not found");
 }
 
 tl_object_ptr<telegram_api::ReplyMarkup> get_input_reply_markup(ContactsManager *contacts_manager,
diff --git a/td/telegram/RequestedDialogType.cpp b/td/telegram/RequestedDialogType.cpp
index c4392e9bc..c61754c30 100644
--- a/td/telegram/RequestedDialogType.cpp
+++ b/td/telegram/RequestedDialogType.cpp
@@ -7,6 +7,8 @@
 #include "td/telegram/RequestedDialogType.h"
 
 #include "td/telegram/ChannelType.h"
+#include "td/telegram/ContactsManager.h"
+#include "td/telegram/Td.h"
 
 namespace td {
 
@@ -60,7 +62,7 @@ RequestedDialogType::RequestedDialogType(telegram_api::object_ptr<telegram_api::
       restrict_has_username_ = (type->flags_ & telegram_api::requestPeerTypeChat::HAS_USERNAME_MASK) != 0;
       has_username_ = type->has_username_;
       is_created_ = type->creator_;
-      restrict_user_administrator_rights_ = type->user_admin_rights_ != nullptr;
+      restrict_user_administrator_rights_ = !is_created_ && type->user_admin_rights_ != nullptr;
       restrict_bot_administrator_rights_ = type->bot_admin_rights_ != nullptr;
       user_administrator_rights_ = AdministratorRights(type->user_admin_rights_, ChannelType::Megagroup);
       bot_administrator_rights_ = AdministratorRights(type->bot_admin_rights_, ChannelType::Megagroup);
@@ -72,7 +74,7 @@ RequestedDialogType::RequestedDialogType(telegram_api::object_ptr<telegram_api::
       restrict_has_username_ = (type->flags_ & telegram_api::requestPeerTypeBroadcast::HAS_USERNAME_MASK) != 0;
       has_username_ = type->has_username_;
       is_created_ = type->creator_;
-      restrict_user_administrator_rights_ = type->user_admin_rights_ != nullptr;
+      restrict_user_administrator_rights_ = !is_created_ && type->user_admin_rights_ != nullptr;
       restrict_bot_administrator_rights_ = type->bot_admin_rights_ != nullptr;
       user_administrator_rights_ = AdministratorRights(type->user_admin_rights_, ChannelType::Broadcast);
       bot_administrator_rights_ = AdministratorRights(type->bot_admin_rights_, ChannelType::Broadcast);
@@ -171,4 +173,95 @@ int32 RequestedDialogType::get_button_id() const {
   return button_id_;
 }
 
+Status RequestedDialogType::check_shared_dialog(Td *td, DialogId dialog_id) const {
+  switch (dialog_id.get_type()) {
+    case DialogType::User: {
+      if (type_ != Type::User) {
+        return Status::Error(400, "Wrong chat type");
+      }
+      auto user_id = dialog_id.get_user_id();
+      if (restrict_is_bot_ && td->contacts_manager_->is_user_bot(user_id) != is_bot_) {
+        return Status::Error(400, "Wrong is_bot value");
+      }
+      if (restrict_is_premium_ && td->contacts_manager_->is_user_premium(user_id) != is_premium_) {
+        return Status::Error(400, "Wrong is_premium value");
+      }
+      break;
+    }
+    case DialogType::Chat: {
+      if (type_ != Type::Group) {
+        return Status::Error(400, "Wrong chat type");
+      }
+      if (restrict_is_forum_ && is_forum_) {
+        return Status::Error(400, "Wrong is_forum value");
+      }
+      if (restrict_has_username_ && has_username_) {
+        return Status::Error(400, "Wrong has_username value");
+      }
+      auto chat_id = dialog_id.get_chat_id();
+      auto status = td->contacts_manager_->get_chat_status(chat_id);
+      if (is_created_ && !status.is_creator()) {
+        return Status::Error(400, "The chat must be created by the current user");
+      }
+      if (bot_is_participant_) {
+        // can't check that the bot is already participant, so check that the user can add it instead
+        if (!status.can_invite_users()) {
+          return Status::Error(400, "The bot can't be added to the chat");
+        }
+      }
+      if (restrict_user_administrator_rights_ && !status.has_all_administrator_rights(user_administrator_rights_)) {
+        return Status::Error(400, "Not enough rights in the chat");
+      }
+      if (restrict_bot_administrator_rights_) {
+        // can't check that the bot is already an administrator, so check that the user can promote it instead
+        if (!status.can_invite_users() || !status.can_promote_members()) {
+          return Status::Error(400, "The bot can't be promoted in the chat");
+        }
+      }
+      break;
+    }
+    case DialogType::Channel: {
+      auto channel_id = dialog_id.get_channel_id();
+      bool is_broadcast = td->contacts_manager_->is_broadcast_channel(channel_id);
+      if (type_ != (is_broadcast ? Type::Channel : Type::Group)) {
+        return Status::Error(400, "Wrong chat type");
+      }
+      if (!is_broadcast && restrict_is_forum_ && td->contacts_manager_->is_forum_channel(channel_id) != is_forum_) {
+        return Status::Error(400, "Wrong is_forum value");
+      }
+      if (restrict_has_username_ &&
+          td->contacts_manager_->get_channel_first_username(channel_id).empty() == has_username_) {
+        return Status::Error(400, "Wrong has_username value");
+      }
+      auto status = td->contacts_manager_->get_channel_status(channel_id);
+      if (is_created_ && !status.is_creator()) {
+        return Status::Error(400, "The chat must be created by the current user");
+      }
+      bool can_invite_bot = status.can_invite_users() &&
+                            (status.is_administrator() || !td->contacts_manager_->is_channel_public(channel_id));
+      if (!is_broadcast && bot_is_participant_) {
+        // can't check that the bot is already participant, so check that the user can add it instead
+        if (!can_invite_bot) {
+          return Status::Error(400, "The bot can't be added to the chat");
+        }
+      }
+      if (restrict_user_administrator_rights_ && !status.has_all_administrator_rights(user_administrator_rights_)) {
+        return Status::Error(400, "Not enough rights in the chat");
+      }
+      if (restrict_bot_administrator_rights_) {
+        // can't check that the bot is already an administrator, so check that the user can promote it instead
+        if (!can_invite_bot || !status.can_promote_members()) {
+          return Status::Error(400, "The bot can't be promoted in the chat");
+        }
+      }
+      break;
+    }
+    case DialogType::SecretChat:
+      return Status::Error(400, "Can't share secret chats");
+    case DialogType::None:
+      UNREACHABLE();
+  }
+  return Status::OK();
+}
+
 }  // namespace td
diff --git a/td/telegram/RequestedDialogType.h b/td/telegram/RequestedDialogType.h
index 82522bd56..7247d6aee 100644
--- a/td/telegram/RequestedDialogType.h
+++ b/td/telegram/RequestedDialogType.h
@@ -6,6 +6,7 @@
 //
 #pragma once
 
+#include "td/telegram/DialogId.h"
 #include "td/telegram/DialogParticipant.h"
 #include "td/telegram/td_api.h"
 #include "td/telegram/telegram_api.h"
@@ -14,6 +15,8 @@
 
 namespace td {
 
+class Td;
+
 class RequestedDialogType {
   enum class Type : int32 { User, Group, Channel };
   Type type_ = Type::User;
@@ -49,6 +52,8 @@ class RequestedDialogType {
 
   int32 get_button_id() const;
 
+  Status check_shared_dialog(Td *td, DialogId dialog_id) const;
+
   template <class StorerT>
   void store(StorerT &storer) const;