diff --git a/Telegram/SourceFiles/data/data_forum_topic.cpp b/Telegram/SourceFiles/data/data_forum_topic.cpp
index 5925f303d..7b5391a19 100644
--- a/Telegram/SourceFiles/data/data_forum_topic.cpp
+++ b/Telegram/SourceFiles/data/data_forum_topic.cpp
@@ -767,6 +767,7 @@ void ForumTopic::maybeSetLastMessage(not_null<HistoryItem*> item) {
 	Expects(item->topicRootId() == _rootId);
 
 	if (!_lastMessage
+		|| !(*_lastMessage)
 		|| ((*_lastMessage)->date() < item->date())
 		|| ((*_lastMessage)->date() == item->date()
 			&& (*_lastMessage)->id < item->id)) {