PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: DELETE FROM {semaphore} WHERE (value = :db_condition_placeholder_0) ; Array ( [:db_condition_placeholder_0] => 5703408906606be550392f2.52679951 ) in lock_release_all() (line 269 of /home/sknf/data/www/sknf.umlub.pl/includes/lock.inc).