diff --git a/public/src/client/category/tools.js b/public/src/client/category/tools.js
index 7159466f6a..74e7111f7f 100644
--- a/public/src/client/category/tools.js
+++ b/public/src/client/category/tools.js
@@ -263,7 +263,7 @@ define('forum/category/tools', [
 	}
 
 	function handlePinnedTopicSort() {
-		if (!ajaxify.data.topics) {
+		if (!ajaxify.data.topics || !ajaxify.data.template.category) {
 			return;
 		}
 		var numPinned = ajaxify.data.topics.reduce(function (memo, topic) {