diff -r 6c3162d9e632 -r 3b70d84e661a web/ldt/ldt_utils/models.py
--- a/web/ldt/ldt_utils/models.py	Tue Oct 12 16:35:06 2010 +0200
+++ b/web/ldt/ldt_utils/models.py	Tue Oct 12 19:09:13 2010 +0200
@@ -329,7 +329,7 @@
                         begin = int(begin)
         
                     uri = None            
-                    if content.media_obj.external_publication_url:
+                    if content.media_obj and content.media_obj.external_publication_url:
                         uri = "%s#t=%d" % (content.media_obj.external_publication_url, begin)
         
                     annotations.append({