diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 38c645dd..ffa74c80 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -7459,7 +7459,6 @@ void ContactsManager::on_get_channel_participants_success(
   LOG(INFO) << "Receive " << participants.size() << " members in " << channel_id;
 
   vector<DialogParticipant> result;
-  CHECK(result.empty());
   for (auto &participant_ptr : participants) {
     result.push_back(get_dialog_participant(channel_id, std::move(participant_ptr)));
     if ((filter.is_bots() && !is_user_bot(result.back().user_id)) ||
@@ -7499,16 +7498,16 @@ void ContactsManager::on_get_channel_participants_success(
           }
         }
         administrator_count = narrow_cast<int32>(administrator_user_ids.size());
+
+        if (get_channel_type(channel_id) == ChannelType::Megagroup && !td_->auth_manager_->is_bot()) {
+          cached_channel_participants_[channel_id] = result;
+          update_channel_online_member_count(channel_id, true);
+        }
       } else if (filter.is_administrators()) {
         administrator_user_ids = std::move(user_ids);
       } else if (filter.is_bots()) {
         bot_user_ids = std::move(user_ids);
       }
-
-      if (get_channel_type(channel_id) == ChannelType::Megagroup && !td_->auth_manager_->is_bot()) {
-        cached_channel_participants_[channel_id] = result;
-        update_channel_online_member_count(channel_id, true);
-      }
     }
     if (filter.is_administrators() || filter.is_recent()) {
       on_update_dialog_administrators(DialogId(channel_id), std::move(administrator_user_ids), true);
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index 79a97607..8f92008c 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -8585,8 +8585,9 @@ void MessagesManager::set_dialog_online_member_count(DialogId dialog_id, int32 o
     return;
   }
 
-  LOG(INFO) << "Set online member count to " << online_member_count << " in " << dialog_id << " from " << source;
   auto &info = dialog_online_member_counts_[dialog_id];
+  LOG(INFO) << "Change online member count from " << info.online_member_count << " to " << online_member_count << " in "
+            << dialog_id << " from " << source;
   bool need_update = d->is_opened && (!info.is_update_sent || info.online_member_count != online_member_count);
   info.online_member_count = online_member_count;
   info.updated_time = Time::now();
@@ -12981,7 +12982,7 @@ void MessagesManager::open_dialog(Dialog *d) {
     case DialogType::Channel:
       if (!is_broadcast_channel(dialog_id)) {
         auto participant_count = td_->contacts_manager_->get_channel_participant_count(dialog_id.get_channel_id());
-        if (1 <= participant_count && participant_count < 195) {
+        if (participant_count < 195) {  // include unknown participant_count
           td_->contacts_manager_->send_get_channel_participants_query(
               dialog_id.get_channel_id(),
               ChannelParticipantsFilter(td_api::make_object<td_api::supergroupMembersFilterRecent>()), 0, 200, 0,