Hi @rkhalikov,
It looks like you have notifications that refer to nonexistent submissions. Could you try the following query?
SELECT * FROM notifications n LEFT JOIN submissions s ON (n.assoc_id=s.submission_id) WHERE n.assoc_type=1048585 AND s.submission_id IS NULL;
Simply deleting any resulting records should resolve the issue, but I’d like to see if I can track down the source of these.
Regards,
Alec Smecher
Public Knowledge Project Team