fixed #2670

public/src/client/chats.js

@@ -18,9 +18,12 @@ define('forum/chats', ['string', 'sounds', 'forum/infinitescroll'], function(S,
 		}
 
 		Chats.addEventListeners();
+		Chats.setActive();
+
+		$(window).on('action:ajaxify.end', function() {
 			Chats.resizeMainWindow();
 			Chats.scrollToBottom(containerEl);
-		Chats.setActive();
+		});
 
 		Chats.initialised = true;
 	};