#4916 DB error sometimes isn't handled properly

inc/classes/BxDolDb.php

@@ -279,6 +279,8 @@ class BxDolDb extends BxDolFactory implements iBxDolSingleton
 			);
 
     	$this->error($oException->errorInfo[self::$_sErrorKey]);
+
+        exit(255);
     }
 
     /**