Whenever a student submits assignment, there is one extra record is getting inteserted in mdl_assign_user_mapping.

e.g. My user id is 5 and I am submiiting an assignment (id 2) using online text, if now I check the mdl_assign_user_mapping table in database, I have two new records

id | assignment | userid
1 | 0 | 5
2 | 2 | 5

So why the record with assignment id 0, I think its a bug.

Thanks
Jaswant