From 969693bb1854d12f3a52d5824e5897c7dc9b4882 Mon Sep 17 00:00:00 2001
From: Alexander Zinchuk <alx.zinchuk@gmail.com>
Date: Sun, 8 Jan 2023 02:44:00 +0100
Subject: [PATCH] Fix exception in `updateChatLastMessage`

---
 src/global/actions/apiUpdaters/messages.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/global/actions/apiUpdaters/messages.ts b/src/global/actions/apiUpdaters/messages.ts
index c1fd4e958..668e85982 100644
--- a/src/global/actions/apiUpdaters/messages.ts
+++ b/src/global/actions/apiUpdaters/messages.ts
@@ -779,7 +779,7 @@ function updateChatLastMessage(
   }
 
   global = updateChat(global, chatId, { lastMessage: message });
-  const topic = chat.isForum ? selectTopicFromMessage(global, message) : undefined;
+  const topic = chat?.isForum ? selectTopicFromMessage(global, message) : undefined;
   if (topic) {
     global = updateTopic(global, chatId, topic.id, {
       lastMessageId: message.id,