When backing up the course, I get this error
Error: mdb->get_record() found more than one record!
- line 1691 of /lib/dml/moodle_database.php: call to debugging()
- line 1651 of /lib/dml/moodle_database.php: call to moodle_database->get_record_sql()
- line 229 of /backup/util/helper/async_helper.class.php: call to moodle_database->get_record_select()
- line 119 of /backup/backup.php: call to async_helper::is_async_pending() Preparing a backup for this resource