Backup and restore

I have experience similar problems with the course backups.
I have 16 courses, but 1 has some kind of error (I try to delete but the process stops without finishing)...
In the mdl_backup_courses table, the information of the problematic course is:

			id	courseid	laststarttime	lastendtime	laststatus	nextstarttime

17

18

1149040856

1149040861

3

1149213600

theproblematic course is the only one with laststatus=3 (in the others, the value is 1)

could I delete this row?