diff --git a/plugins/tps/reklama/components/advertisement/default.htm b/plugins/tps/reklama/components/advertisement/default.htm
index 5d951b93a..1ad7cef7f 100644
--- a/plugins/tps/reklama/components/advertisement/default.htm
+++ b/plugins/tps/reklama/components/advertisement/default.htm
@@ -3,7 +3,9 @@
 {% put scripts %}
 <script>
     $.request('{{__SELF__}}::onDisplay',{
-        data:{random:{{__SELF__.property('random')}},css_class:{{__SELF__.property('css_class')}}}
+        data:{random:{{__SELF__.property('random')}}
+    {% if __SELF__.property('css_class') %},css_class:{{__SELF__.property('css_class')}} {% endif %}
+        }
     });
 </script>
 {% endput %}