diff --git a/openslides/projector/static/javascript/projector.js b/openslides/projector/static/javascript/projector.js
index c701d77f6..4e0ee8714 100644
--- a/openslides/projector/static/javascript/projector.js
+++ b/openslides/projector/static/javascript/projector.js
@@ -5,16 +5,22 @@
  * :license: GNU GPL, see LICENSE for more details.
  */
 
+content_hash = null;
+
 function presentation_reload() {
+    
     if ($('#config > #ajax').html() == 'on') {
         $.ajax({
             type: 'GET',
             url: '/projector/',
             dataType: 'json',
-            data: '',
             success: function(data) {
                 $('#currentTime').removeClass('ajax_error');
-                $('#content').html(data.content);
+                var new_content_hash = data['content_hash'];
+                if (new_content_hash != content_hash) {
+                    $('#content').html(data.content);
+                    content_hash = new_content_hash;
+                }
                 $('#scrollcontent').html(data.scrollcontent);
                 document.title = data.title;
                 $('#currentTime').html(data.time);
diff --git a/openslides/projector/views.py b/openslides/projector/views.py
index 6ad6b0538..8a8d5612a 100644
--- a/openslides/projector/views.py
+++ b/openslides/projector/views.py
@@ -231,6 +231,7 @@ class Projector(TemplateView, AjaxMixin):
         scrollcontent = render_block_to_string(self.get_template_names()[0], 'scrollcontent', self.data)
 
         context = super(Projector, self).get_ajax_context(**kwargs)
+        content_hash = hash(content)
         context.update({
             'content': content,
             'scrollcontent': scrollcontent,
@@ -239,6 +240,7 @@ class Projector(TemplateView, AjaxMixin):
             'title': self.data['title'],
             'bigger': config['bigger'],
             'up': config['up'],
+            'content_hash': content_hash,
         })
         return context