Default exception handler: Can not find data record in database table forum_discussions. Debug: SELECT * FROM {forum_discussions} WHERE id = ? [array ( 0 => 15, )] Error code: invalidrecord * line 1533 of \lib\dml\moodle_database.php: dml_missing_record_exception thrown * line 1509 of \lib\dml\moodle_database.php: call to moodle_database->get_record_select() * line 43 of \mod\forum\discuss.php: call to moodle_database->get_record()