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Error message

PDOException: SQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction: DELETE FROM {semaphore} WHERE (name = :db_condition_placeholder_0) AND (value = :db_condition_placeholder_1) ; Array ( [:db_condition_placeholder_0] => variable_init [:db_condition_placeholder_1] => 2405767796165e7bfe1e301.85007435 ) in lock_release() (line 254 of /var/www/html/includes/lock.inc).