diff --git a/js/aside-script.js b/js/aside-script.js
index f35ddb8..c5f191b 100644
--- a/js/aside-script.js
+++ b/js/aside-script.js
@@ -123,7 +123,7 @@ function AddCollection(collection)
 	for (var i = 0; i < collection.links.length; i++)
 	{
 		rawTabs +=
-			"<div title='" + collection.titles[i] + "'" + ((collection.thumbnails[i]) ? " style='background-image: url(" + collection.thumbnails[i] + ")'" : "") + ">" +
+			"<div title='" + collection.titles[i] + "'" + ((collection.thumbnails && collection.thumbnails[i]) ? " style='background-image: url(" + collection.thumbnails[i] + ")'" : "") + ">" +
 			"<span value='" + collection.links[i] + "'></span>" +
 			"<div>" +
 			"<div" + ((collection.icons[i] == 0 || collection.icons[i] == null) ? "" : " style='background-image: url(\"" + collection.icons[i] + "\")'") + "></div>" +