Additional uncaught exception thrown while handling exception.

Original

PDOException: SQLSTATE[HY000] [2002] Connection refused in drupal_is_denied() (line 2206 of /srv/www/drupal7/includes/bootstrap.inc).

Additional

PDOException: SQLSTATE[HY000] [2002] Connection refused in _apdqc_dblog_watchdog() (line 325 of /srv/www/drupal7/sites/all/modules/apdqc/apdqc.module).