diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 71c3e76320aa..2ef1b65f7dfd 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -6276,6 +6276,10 @@ UserId ContactsManager::add_channel_bot_user() {
   return user_id;
 }
 
+ChatId ContactsManager::get_unsupported_chat_id() {
+  return ChatId(static_cast<int64>(G()->is_test_dc() ? 10304875 : 1535424647));
+}
+
 void ContactsManager::check_dialog_username(DialogId dialog_id, const string &username,
                                             Promise<CheckDialogUsernameResult> &&promise) {
   if (dialog_id != DialogId() && !dialog_id.is_valid()) {
diff --git a/td/telegram/ContactsManager.h b/td/telegram/ContactsManager.h
index adc724a673c4..9b1b2115e6b3 100644
--- a/td/telegram/ContactsManager.h
+++ b/td/telegram/ContactsManager.h
@@ -311,6 +311,8 @@ class ContactsManager final : public Actor {
 
   UserId add_channel_bot_user();
 
+  static ChatId get_unsupported_chat_id();
+
   void on_update_username_is_active(UserId user_id, string &&username, bool is_active, Promise<Unit> &&promise);
 
   void on_update_active_usernames_order(UserId user_id, vector<string> &&usernames, Promise<Unit> &&promise);
diff --git a/td/telegram/UpdatesManager.cpp b/td/telegram/UpdatesManager.cpp
index a71268f21412..d69ad1813b3a 100644
--- a/td/telegram/UpdatesManager.cpp
+++ b/td/telegram/UpdatesManager.cpp
@@ -1613,6 +1613,9 @@ vector<DialogId> UpdatesManager::get_chat_dialog_ids(const telegram_api::Updates
       LOG(ERROR) << "Can't find identifier of " << oneline(to_string(chat));
     }
   }
+  if (dialog_ids.size() > 1) {
+    td::remove(dialog_ids, DialogId(ContactsManager::get_unsupported_chat_id()));
+  }
   return dialog_ids;
 }