From c8c327566b44b96faffa6eb407eefedfa9052cf3 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Fri, 2 Jan 2026 14:46:27 +0400
Subject: [PATCH] Always keep General topic, don't delete all.

---
 Telegram/SourceFiles/data/data_forum.cpp | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/Telegram/SourceFiles/data/data_forum.cpp b/Telegram/SourceFiles/data/data_forum.cpp
index a82afd9b4b..2ce2861839 100644
--- a/Telegram/SourceFiles/data/data_forum.cpp
+++ b/Telegram/SourceFiles/data/data_forum.cpp
@@ -366,10 +366,7 @@ void Forum::applyReceivedTopics(
 		const auto rootId = topic.match([&](const auto &data) {
 			return data.vid().v;
 		});
-		_staleRootIds.remove(rootId);
-		topic.match([&](const MTPDforumTopicDeleted &data) {
-			applyTopicDeleted(rootId);
-		}, [&](const MTPDforumTopic &data) {
+		const auto apply = [&](const MTPDforumTopic *fields = nullptr) {
 			_topicsDeleted.remove(rootId);
 			const auto i = _topics.find(rootId);
 			const auto creating = (i == end(_topics));
@@ -379,7 +376,9 @@ void Forum::applyReceivedTopics(
 					std::make_unique<ForumTopic>(this, rootId)
 				).first->second.get()
 				: i->second.get();
-			raw->applyTopic(data);
+			if (fields) {
+				raw->applyTopic(*fields);
+			}
 			if (creating) {
 				if (const auto last = _history->chatListMessage()
 					; last && last->topicRootId() == rootId) {
@@ -390,6 +389,19 @@ void Forum::applyReceivedTopics(
 			if (callback) {
 				callback(raw);
 			}
+		};
+
+		_staleRootIds.remove(rootId);
+		topic.match([&](const MTPDforumTopicDeleted &data) {
+			if (rootId != ForumTopic::kGeneralId) {
+				applyTopicDeleted(rootId);
+			} else {
+				// We shouldn't delete general topic in any case.
+				// Here this happens in bot forums, for example.
+				apply();
+			}
+		}, [&](const MTPDforumTopic &data) {
+			apply(&data);
 		});
 	}
 }