diff --git a/js/h5p-x-api-event.js b/js/h5p-x-api-event.js
index e012ac1..4d67b84 100644
--- a/js/h5p-x-api-event.js
+++ b/js/h5p-x-api-event.js
@@ -239,7 +239,7 @@ H5P.XAPIEvent.prototype.getScore = function () {
  */
 H5P.XAPIEvent.prototype.getContentXAPIId = function (instance) {
   var xAPIId;
-  if (instance.contentId && H5PIntegration && H5PIntegration.contents) {
+  if (instance.contentId && H5PIntegration && H5PIntegration.contents && H5PIntegration.contents['cid-' + instance.contentId]) {
     xAPIId =  H5PIntegration.contents['cid-' + instance.contentId].url;
     if (instance.subContentId) {
       xAPIId += '?subContentId=' +  instance.subContentId;