diff --git a/public/src/client/chats.js b/public/src/client/chats.js
index f5b1d094cb..2165d919ea 100644
--- a/public/src/client/chats.js
+++ b/public/src/client/chats.js
@@ -498,7 +498,13 @@ define('forum/chats', [
 
 	Chats.resizeMainWindow = function () {
 		var viewportHeight = $(window).height();
-		var fromTop = components.get('chat/main-wrapper').offset().top || components.get('chat/nav-wrapper').offset().top;
+		var mainWrapper = components.get('chat/main-wrapper');
+		var navWrapper = components.get('chat/nav-wrapper');
+		var fromTop = 0;
+		if (mainWrapper.length && navWrapper.length) {
+			fromTop = mainWrapper.offset().top || navWrapper.offset().top;
+		}
+
 		$('.chats-full').height(viewportHeight - fromTop - 1);
 
 		Chats.setActive();