Additional uncaught exception thrown while handling exception.

Original

PDOException: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in drupal_is_denied() (line 2178 of /var/www/tops/data/www/tops.ua/includes/bootstrap.inc).

Additional

PDOException: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in db_select() (line 2579 of /var/www/tops/data/www/tops.ua/includes/database/database.inc).