diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 6905de650..42c31b856 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -13128,7 +13128,7 @@ void ContactsManager::on_get_chat_full(tl_object_ptr<telegram_api::ChatFull> &&c
                                                    MessageId(ServerMessageId(channel->read_outbox_max_id_)));
     if ((channel->flags_ & CHANNEL_FULL_FLAG_HAS_AVAILABLE_MIN_MESSAGE_ID) != 0) {
       td_->messages_manager_->on_update_channel_max_unavailable_message_id(
-          channel_id, MessageId(ServerMessageId(channel->available_min_id_)));
+          channel_id, MessageId(ServerMessageId(channel->available_min_id_)), "ChannelFull");
     }
     td_->messages_manager_->on_read_channel_inbox(channel_id, MessageId(ServerMessageId(channel->read_inbox_max_id_)),
                                                   channel->unread_count_, channel->pts_, "ChannelFull");
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index c2fcc3d5a..b8ca1d8c9 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -7484,20 +7484,20 @@ void MessagesManager::on_read_channel_outbox(ChannelId channel_id, MessageId max
 }
 
 void MessagesManager::on_update_channel_max_unavailable_message_id(ChannelId channel_id,
-                                                                   MessageId max_unavailable_message_id) {
+                                                                   MessageId max_unavailable_message_id,
+                                                                   const char *source) {
   if (!channel_id.is_valid()) {
-    LOG(ERROR) << "Receive max_unavailable_message_id in invalid " << channel_id;
+    LOG(ERROR) << "Receive max_unavailable_message_id in invalid " << channel_id << " from " << source;
     return;
   }
 
   DialogId dialog_id(channel_id);
   CHECK(!max_unavailable_message_id.is_scheduled());
   if (!max_unavailable_message_id.is_valid() && max_unavailable_message_id != MessageId()) {
-    LOG(ERROR) << "Receive wrong max_unavailable_message_id: " << max_unavailable_message_id;
+    LOG(ERROR) << "Receive wrong max_unavailable_message_id: " << max_unavailable_message_id << " from " << source;
     max_unavailable_message_id = MessageId();
   }
-  set_dialog_max_unavailable_message_id(dialog_id, max_unavailable_message_id, true,
-                                        "on_update_channel_max_unavailable_message_id");
+  set_dialog_max_unavailable_message_id(dialog_id, max_unavailable_message_id, true, source);
 }
 
 void MessagesManager::on_update_dialog_online_member_count(DialogId dialog_id, int32 online_member_count,
diff --git a/td/telegram/MessagesManager.h b/td/telegram/MessagesManager.h
index af2c87b93..7e2105d73 100644
--- a/td/telegram/MessagesManager.h
+++ b/td/telegram/MessagesManager.h
@@ -376,7 +376,8 @@ class MessagesManager final : public Actor {
 
   void on_read_channel_outbox(ChannelId channel_id, MessageId max_message_id);
 
-  void on_update_channel_max_unavailable_message_id(ChannelId channel_id, MessageId max_unavailable_message_id);
+  void on_update_channel_max_unavailable_message_id(ChannelId channel_id, MessageId max_unavailable_message_id,
+                                                    const char *source);
 
   void on_update_dialog_online_member_count(DialogId dialog_id, int32 online_member_count, bool is_from_server);
 
diff --git a/td/telegram/UpdatesManager.cpp b/td/telegram/UpdatesManager.cpp
index 55f981b4f..a4d68f030 100644
--- a/td/telegram/UpdatesManager.cpp
+++ b/td/telegram/UpdatesManager.cpp
@@ -3428,7 +3428,8 @@ void UpdatesManager::on_update(tl_object_ptr<telegram_api::updateChannelMessageF
 void UpdatesManager::on_update(tl_object_ptr<telegram_api::updateChannelAvailableMessages> update,
                                Promise<Unit> &&promise) {
   td_->messages_manager_->on_update_channel_max_unavailable_message_id(
-      ChannelId(update->channel_id_), MessageId(ServerMessageId(update->available_min_id_)));
+      ChannelId(update->channel_id_), MessageId(ServerMessageId(update->available_min_id_)),
+      "updateChannelAvailableMessages");
   promise.set_value(Unit());
 }