diff --git a/polynum_blackboard/management/commands/send-to-mycourse.py b/polynum_blackboard/management/commands/send-to-mycourse.py
index e01aceb..327b47b 100644
--- a/polynum_blackboard/management/commands/send-to-mycourse.py
+++ b/polynum_blackboard/management/commands/send-to-mycourse.py
@@ -56,6 +56,7 @@ class Command(BaseCommand):
                     push.sent = True
                     if ok:
                         logger.info('sending succeeded')
+                        push.failure = ''
                     else:
                         push.failure = result
                         logger.error('sending failed: %r', result.encode('utf-8'))