diff -r a7cf2887e993 -r ed05b89e3299 cms/app-client/app/components/transcript-component.js
--- a/cms/app-client/app/components/transcript-component.js	Tue Aug 16 00:16:08 2016 +0200
+++ b/cms/app-client/app/components/transcript-component.js	Wed Aug 17 15:30:19 2016 +0200
@@ -16,9 +16,10 @@
 
     didUpdate: function() {
         var self = this;
-        if(this.get('autoscroll')) {
+        var target = Ember.$('.sentence.active');
+        if(this.get('autoscroll') && target.length) {
             Ember.$(this.get('autoscrollElement')).animate({
-                scrollTop: Ember.$('.sentence.active').offset().top + Ember.$(this.get('autoscrollElement')).scrollTop() - Ember.$(this.get('autoscrollElement')).offset().top - 154
+                scrollTop: target.offset().top + Ember.$(this.get('autoscrollElement')).scrollTop() - Ember.$(this.get('autoscrollElement')).offset().top - 154
             }, 150);
         }
     },