diff --git a/td/telegram/CallbackQueriesManager.cpp b/td/telegram/CallbackQueriesManager.cpp
index 3e5eb466..d02e7b48 100644
--- a/td/telegram/CallbackQueriesManager.cpp
+++ b/td/telegram/CallbackQueriesManager.cpp
@@ -241,6 +241,10 @@ int64 CallbackQueriesManager::send_callback_query(FullMessageId full_message_id,
     promise.set_error(Status::Error(5, "Message not found"));
     return 0;
   }
+  if (full_message_id.get_message_id().is_valid_scheduled()) {
+    promise.set_error(Status::Error(5, "Can't send callback queries from scheduled messages"));
+    return 0;
+  }
   if (!full_message_id.get_message_id().is_server()) {
     promise.set_error(Status::Error(5, "Bad message identifier"));
     return 0;
diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 5fbe3f3e..8341367b 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -5274,6 +5274,10 @@ void ContactsManager::report_channel_spam(ChannelId channel_id, UserId user_id,
 
   vector<MessageId> server_message_ids;
   for (auto &message_id : message_ids) {
+    if (message_id.is_valid_scheduled()) {
+      return promise.set_error(Status::Error(6, "Can't report scheduled messages"));
+    }
+
     if (!message_id.is_valid()) {
       return promise.set_error(Status::Error(6, "Message not found"));
     }
diff --git a/td/telegram/MessageContent.cpp b/td/telegram/MessageContent.cpp
index 2b33c9d0..1d6ed361 100644
--- a/td/telegram/MessageContent.cpp
+++ b/td/telegram/MessageContent.cpp
@@ -3360,6 +3360,9 @@ bool merge_message_content_file_id(Td *td, MessageContent *message_content, File
 }
 
 void register_message_content(Td *td, const MessageContent *content, FullMessageId full_message_id) {
+  if (full_message_id.get_message_id().is_scheduled()) {
+    return;
+  }
   switch (content->get_type()) {
     case MessageContentType::Poll:
       return td->poll_manager_->register_poll(static_cast<const MessagePoll *>(content)->poll_id, full_message_id);
@@ -3369,6 +3372,9 @@ void register_message_content(Td *td, const MessageContent *content, FullMessage
 }
 
 void unregister_message_content(Td *td, const MessageContent *content, FullMessageId full_message_id) {
+  if (full_message_id.get_message_id().is_scheduled()) {
+    return;
+  }
   switch (content->get_type()) {
     case MessageContentType::Poll:
       return td->poll_manager_->unregister_poll(static_cast<const MessagePoll *>(content)->poll_id, full_message_id);
diff --git a/td/telegram/MessageId.cpp b/td/telegram/MessageId.cpp
index 00bf9dac..432634d8 100644
--- a/td/telegram/MessageId.cpp
+++ b/td/telegram/MessageId.cpp
@@ -64,10 +64,12 @@ MessageType MessageId::get_type() const {
 }
 
 ServerMessageId MessageId::get_server_message_id_force() const {
+  CHECK(!is_scheduled());
   return ServerMessageId(narrow_cast<int32>(id >> SERVER_ID_SHIFT));
 }
 
 MessageId MessageId::get_next_message_id(MessageType type) const {
+  CHECK(!is_scheduled());
   switch (type) {
     case MessageType::Server:
       return get_next_server_message_id();
diff --git a/td/telegram/MessageId.h b/td/telegram/MessageId.h
index f0bc88eb..12f8c746 100644
--- a/td/telegram/MessageId.h
+++ b/td/telegram/MessageId.h
@@ -43,6 +43,7 @@ class MessageId {
   ServerMessageId get_server_message_id_force() const;
 
   int32 get_scheduled_server_message_id_force() const {
+    CHECK(is_scheduled());
     return static_cast<int32>((id >> 3) & ((1 << 18) - 1));
   }
 
@@ -108,11 +109,13 @@ class MessageId {
 
   // returns greatest server message id not bigger than this message id
   MessageId get_prev_server_message_id() const {
+    CHECK(!is_scheduled());
     return MessageId(id & ~FULL_TYPE_MASK);
   }
 
   // returns smallest server message id not less than this message id
   MessageId get_next_server_message_id() const {
+    CHECK(!is_scheduled());
     return MessageId((id + FULL_TYPE_MASK) & ~FULL_TYPE_MASK);
   }
 
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index 77cc258f..ed0c62b4 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -25663,6 +25663,10 @@ bool MessagesManager::update_message_content(DialogId dialog_id, Message *old_me
                                              unique_ptr<MessageContent> new_content,
                                              bool need_send_update_message_content, bool need_merge_files,
                                              bool is_message_in_dialog) {
+  if (old_message->message_id.is_scheduled()) {
+    is_message_in_dialog = false;
+  }
+
   bool is_content_changed = false;
   bool need_update = false;
   unique_ptr<MessageContent> &old_content = old_message->content;
@@ -28336,6 +28340,9 @@ void MessagesManager::set_poll_answer(FullMessageId full_message_id, vector<int3
   if (m->content->get_type() != MessageContentType::Poll) {
     return promise.set_error(Status::Error(5, "Message is not a poll"));
   }
+  if (full_message_id.get_message_id().is_scheduled()) {
+    return promise.set_error(Status::Error(5, "Can't answer polls from scheduled messages"));
+  }
   if (!full_message_id.get_message_id().is_server()) {
     return promise.set_error(Status::Error(5, "Poll can't be answered"));
   }
@@ -28361,6 +28368,9 @@ void MessagesManager::stop_poll(FullMessageId full_message_id, td_api::object_pt
   if (!can_edit_message(full_message_id.get_dialog_id(), m, true)) {
     return promise.set_error(Status::Error(5, "Poll can't be stopped"));
   }
+  if (full_message_id.get_message_id().is_scheduled()) {
+    return promise.set_error(Status::Error(5, "Can't stop polls from scheduled messages"));
+  }
   if (!full_message_id.get_message_id().is_server()) {
     return promise.set_error(Status::Error(5, "Poll can't be stopped"));
   }
@@ -28384,6 +28394,9 @@ Result<ServerMessageId> MessagesManager::get_invoice_message_id(FullMessageId fu
     return Status::Error(5, "Message has no invoice");
   }
   auto message_id = full_message_id.get_message_id();
+  if (message_id.is_scheduled()) {
+    return Status::Error(5, "Wrong scheduled message identifier");
+  }
   if (!message_id.is_server()) {
     return Status::Error(5, "Wrong message identifier");
   }
@@ -28435,6 +28448,9 @@ void MessagesManager::get_payment_receipt(FullMessageId full_message_id,
     return promise.set_error(Status::Error(5, "Message has wrong type"));
   }
   auto message_id = full_message_id.get_message_id();
+  if (message_id.is_scheduled()) {
+    return promise.set_error(Status::Error(5, "Can't get payment receipt from scheduled messages"));
+  }
   if (!message_id.is_server()) {
     return promise.set_error(Status::Error(5, "Wrong message identifier"));
   }
diff --git a/td/telegram/net/NetQuery.h b/td/telegram/net/NetQuery.h
index 4e355b36..70c2533f 100644
--- a/td/telegram/net/NetQuery.h
+++ b/td/telegram/net/NetQuery.h
@@ -293,7 +293,7 @@ class NetQuery : public ListNode {
   static int32 get_my_id();
 
   movable_atomic<uint64> session_id_{0};
-  uint64 message_id_{};
+  uint64 message_id_{0};
 
   movable_atomic<int32> cancellation_token_{-1};  // == 0 if query is canceled
   ActorShared<NetQueryCallback> callback_;