From: Vincent Vanwaelscappel <vincent@cubedesigners.com>
Date: Fri, 6 Oct 2023 09:42:21 +0000 (+0200)
Subject: wait #6349 @0:10
X-Git-Url: http://git.cubedesigners.com/?a=commitdiff_plain;h=667cf0bf9be96d85fac9245bf6f044dbb50886dc;p=fluidbook-toolbox-quiz.git

wait #6349 @0:10
---

diff --git a/js/quiz.resize.js b/js/quiz.resize.js
index bfddaf4..c5f9f61 100644
--- a/js/quiz.resize.js
+++ b/js/quiz.resize.js
@@ -133,7 +133,8 @@ QuizResize.prototype = {
     updateBackground: function (b, v) {
         let c = '';
 
-        if (v === undefined) {
+        if (v === undefined || v === null || v === '' || v.indexOf('.') === -1) {
+            $(b).html('');
             return;
         }
         if (v.toLowerCase().indexOf('.json') >= 0) {