From 77078f704c9ca6c8fc16850f107ffb15196381c9 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Wed, 28 Dec 2022 12:44:01 +0400
Subject: [PATCH] Fix a crash in topic deletion.

---
 .../SourceFiles/window/window_session_controller.cpp   | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Telegram/SourceFiles/window/window_session_controller.cpp b/Telegram/SourceFiles/window/window_session_controller.cpp
index 7f82d249f..4233de048 100644
--- a/Telegram/SourceFiles/window/window_session_controller.cpp
+++ b/Telegram/SourceFiles/window/window_session_controller.cpp
@@ -1749,7 +1749,15 @@ void SessionController::showSection(
 }
 
 void SessionController::showBackFromStack(const SectionShow &params) {
-	content()->showBackFromStack(params);
+	const auto bad = [&] {
+		// If we show a currently-being-destroyed topic, then
+		// skip it and show back one more.
+		const auto topic = _activeChatEntry.current().key.topic();
+		return topic && topic->forum()->topicDeleted(topic->rootId());
+	};
+	do {
+		content()->showBackFromStack(params);
+	} while (bad());
 }
 
 void SessionController::showSpecialLayer(