From af73084d1d8b10191d128efc9f6214462ba714db Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Thu, 27 Oct 2022 20:03:57 +0300
Subject: [PATCH] Check that identifier of the edited topic wasn't changed.

---
 td/telegram/DialogEventLog.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/td/telegram/DialogEventLog.cpp b/td/telegram/DialogEventLog.cpp
index 0341b87e2..079061804 100644
--- a/td/telegram/DialogEventLog.cpp
+++ b/td/telegram/DialogEventLog.cpp
@@ -374,7 +374,9 @@ static td_api::object_ptr<td_api::ChatEventAction> get_chat_event_action_object(
       auto action = move_tl_object_as<telegram_api::channelAdminLogEventActionEditTopic>(action_ptr);
       auto old_topic_info = ForumTopicInfo(action->prev_topic_);
       auto new_topic_info = ForumTopicInfo(action->new_topic_);
-      if (old_topic_info.is_empty() || new_topic_info.is_empty()) {
+      if (old_topic_info.is_empty() || new_topic_info.is_empty() ||
+          old_topic_info.get_thread_id() != new_topic_info.get_thread_id()) {
+        LOG(ERROR) << "Receive " << to_string(action);
         return nullptr;
       }
       if (old_topic_info.is_closed() != new_topic_info.is_closed()) {