diff --git a/example/README.md b/example/README.md
index 7bdbd7fef..1fdabe5ac 100644
--- a/example/README.md
+++ b/example/README.md
@@ -91,7 +91,7 @@ You can also see [JTDLib](https://github.com/ErnyTech/JTDLib) for another exampl
 <a name="kotlin"></a>
 ## Using TDLib in Kotlin projects
 
-TDLib can be used from the Kotlin/JVM programming language through same way as in [JAVA](#java).
+TDLib can be used from the Kotlin/JVM programming language through same way as in [Java](#java).
 
 You can also use [ktd](https://github.com/whyoleg/ktd) library with kotlin specific bindings.
 
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index 9303b2881..c00f14406 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -12578,10 +12578,9 @@ unique_ptr<MessagesManager::Message> MessagesManager::do_delete_message(Dialog *
     return nullptr;
   }
 
-  LOG_CHECK(!d->being_deleted_message_id.is_valid()) << d->being_deleted_message_id << " " << message_id << " "
-                                                     << d->debug_being_deleted_message_id_source << " " << source;
+  LOG_CHECK(!d->being_deleted_message_id.is_valid())
+      << d->being_deleted_message_id << " " << message_id << " " << source;
   d->being_deleted_message_id = message_id;
-  d->debug_being_deleted_message_id_source = source;
 
   if (is_debug_message_op_enabled()) {
     d->debug_message_op.emplace_back(Dialog::MessageOp::Delete, m->message_id, m->content->get_type(), false,
@@ -12708,7 +12707,6 @@ unique_ptr<MessagesManager::Message> MessagesManager::do_delete_message(Dialog *
   auto result = treap_delete_message(v);
 
   d->being_deleted_message_id = MessageId();
-  d->debug_being_deleted_message_id_source = "";
 
   if (!only_from_memory) {
     if (need_get_history && !td_->auth_manager_->is_bot() && have_input_peer(d->dialog_id, AccessRights::Read)) {
@@ -25810,7 +25808,7 @@ MessagesManager::Message *MessagesManager::add_message_to_dialog(Dialog *d, uniq
     if (message_id.is_server()) {
       if (d->being_added_message_id.is_valid()) {
         // if a too new message not from update has failed to preload before being_added_message_id was set,
-        // then it should fail to load event after it is set and last_new_message_id has changed
+        // then it should fail to load even after it is set and last_new_message_id has changed
         max_message_id = d->being_updated_last_new_message_id;
       } else {
         max_message_id = d->last_new_message_id;
@@ -26012,19 +26010,13 @@ MessagesManager::Message *MessagesManager::add_message_to_dialog(Dialog *d, uniq
   // there must be no two recursive calls to add_message_to_dialog
   LOG_CHECK(!d->being_added_message_id.is_valid())
       << d->dialog_id << " " << d->being_added_message_id << " " << message_id << " " << *need_update << " "
-      << d->debug_being_added_need_update << " " << d->pinned_message_notification_message_id << " "
-      << preloaded_pinned_message_id << " " << d->debug_preloaded_pinned_message_id << " "
-      << d->debug_added_pinned_message_id << " " << d->debug_add_message_to_dialog_fail_reason << " " << source;
-  LOG_CHECK(!d->being_deleted_message_id.is_valid()) << d->being_deleted_message_id << " " << message_id << " "
-                                                     << d->debug_being_deleted_message_id_source << " " << source;
+      << d->pinned_message_notification_message_id << " " << preloaded_pinned_message_id << " " << source;
+  LOG_CHECK(!d->being_deleted_message_id.is_valid())
+      << d->being_deleted_message_id << " " << message_id << " " << source;
 
   d->being_added_message_id = message_id;
   d->being_updated_last_new_message_id = d->last_new_message_id;
   d->being_updated_last_database_message_id = d->last_database_message_id;
-  d->debug_being_added_need_update = *need_update;
-  d->debug_preloaded_pinned_message_id = preloaded_pinned_message_id;
-  d->debug_added_pinned_message_id = added_pinned_message_id;
-  d->debug_add_message_to_dialog_fail_reason = add_error_reason;
 
   if (d->new_secret_chat_notification_id.is_valid()) {
     remove_new_secret_chat_notification(d, true);
diff --git a/td/telegram/MessagesManager.h b/td/telegram/MessagesManager.h
index 122d2027d..3220080ca 100644
--- a/td/telegram/MessagesManager.h
+++ b/td/telegram/MessagesManager.h
@@ -1069,11 +1069,6 @@ class MessagesManager : public Actor {
     MessageId being_updated_last_new_message_id;
     MessageId being_updated_last_database_message_id;
     MessageId being_deleted_message_id;
-    const char *debug_being_deleted_message_id_source = "";
-    bool debug_being_added_need_update = false;   // TODO remove
-    MessageId debug_preloaded_pinned_message_id;  // TODO remove
-    MessageId debug_added_pinned_message_id;      // TODO remove
-    const char *debug_add_message_to_dialog_fail_reason = "";
 
     NotificationGroupInfo message_notification_group;
     NotificationGroupInfo mention_notification_group;