diff --git a/public/src/modules/helpers.js b/public/src/modules/helpers.js
index 2700aab137..1210b10753 100644
--- a/public/src/modules/helpers.js
+++ b/public/src/modules/helpers.js
@@ -73,6 +73,9 @@
 	};
 
 	helpers.generateCategoryBackground = function(category) {
+		if (!category) {
+			return '';
+		}
 		var style = [];
 
 		if (category.bgColor) {