diff --git a/polynum_blackboard/management/commands/send-to-mycourse.py b/polynum_blackboard/management/commands/send-to-mycourse.py
index b8a96e4..b5f1426 100644
--- a/polynum_blackboard/management/commands/send-to-mycourse.py
+++ b/polynum_blackboard/management/commands/send-to-mycourse.py
@@ -29,12 +29,14 @@ class Command(BaseCommand):
         logger = logging.getLogger(__name__)
         bb_pushs = models.BlackBoardPush.objects.filter(sent=False)
         if options['delete']:
-            qs = models.BlackBoardPush.objects.filter(id__in=options['delete'].split(','))
+            qs = models.BlackBoardPush.objects.filter(id__in=options['delete'].split(','), request__isnull=Falsoe)
             for push in qs:
                 print ' - deleted push request %s for document %s' % (push.id, push.request.id)
             qs.delete()
         if options['list']:
             for push in bb_pushs:
+                if not push.request or not push.request.uploadfile:
+                    continue
                 print ' -', push.id, 'document', os.path.basename(push.request.uploadfile.name).encode('utf-8'), '(%s)' % \
                     push.request.id, 'de', push.request.user.display_name().encode('utf-8'), 'dans le cours', push.course_name.encode('utf-8'),
                 if push.visible_to_students: