diff --git a/public/src/modules/navigator.js b/public/src/modules/navigator.js
index 824f55434a..2937470707 100644
--- a/public/src/modules/navigator.js
+++ b/public/src/modules/navigator.js
@@ -559,7 +559,7 @@ define('navigator', ['forum/pagination', 'components', 'hooks', 'alerts'], funct
 		}
 
 		const postHeight = scrollTo.outerHeight(true);
-		const navbarHeight = components.get('navbar').outerHeight(true);
+		const navbarHeight = components.get('navbar').outerHeight(true) || 0;
 		const topicHeaderHeight = $('.topic-header').outerHeight(true) || 0;
 		const viewportHeight = $(window).height();