diff --git a/templates/macros.html b/templates/macros.html
index 1e95d1fd9680e547463f4209466ec2ae241d2f34..c8d03dbbf5cd8a2347b24e6c848e4c42cdebbc19 100644
--- a/templates/macros.html
+++ b/templates/macros.html
@@ -2,7 +2,7 @@
 <li class="list-group-item">
 	<a class="hidden-xs" href="{{url_for('lecture', id=lecture['id'])}}" title="{{ lecture['coursetitle'] }}" style="color: #000">
 		<div class="row">
-			<img class="col-xs-4" style="max-height: 100px; width: auto;" src="{{ config.VIDEOPREFIX }}/{{ lecture['titlefile'] }}" alt="Vorschaubild">
+			<img class="col-xs-4" style="max-height: 100px; width: auto;" src="{{ config.VIDEOPREFIX }}/{{ lecture['titlefile'] }}" alt="Vorschaubild" onerror="this.src='{{url_for('static',filename='no-thumbnail.png')}}'">
 			<div class="col-xs-4">
 				<span><strong>{{ lecture['short'] }}</strong></span><br>
 				<span>{{ lecture['time'] }}</span>
@@ -19,7 +19,7 @@
 	<a class="visible-xs" href="{{url_for('lecture', id=lecture['id'])}}" title="{{ lecture['coursetitle'] }}" style="color: #000">
 		<ul class="list-unstyled">
 			<li>
-				<img style="width: 100%;" src="{{ config.VIDEOPREFIX }}/{{ lecture['titlefile'] }}" alt="Vorschaubild">
+				<img style="width: 100%;" src="{{ config.VIDEOPREFIX }}/{{ lecture['titlefile'] }}" alt="Vorschaubild" onerror="this.src='{{url_for('static',filename='no-thumbnail.png')}}'">
 			</li>
 			<li>
 				<strong>{{ lecture['short'] }}</strong>	{{ lecture['time'] }}
@@ -124,7 +124,7 @@ $('#embedcodebtn').popover(
 {% macro lecture_list_item(lecture,videos) %}
 <li class="list-group-item" id="lecture-{{lecture.id}}">
 	<div class="row">
-		<img class="col-sm-2 col-xs-12"src="https://videoag.fsmpi.rwth-aachen.de/{{lecture.titlefile}}" alt="Vorschaubild">
+		<img class="col-sm-2 col-xs-12"src="{{ config.VIDEOPREFIX }}/{{lecture.titlefile}}" alt="Vorschaubild" onerror="this.src='{{url_for('static',filename='no-thumbnail.png')}}'">
 		<span class="col-sm-3 col-xs-12">
 			<ul class="list-unstyled">
 				<li>{{ valueeditor(['lectures',lecture.id,'title'], lecture.title) }}</li>