Undefined variable: charset

« MODx Parse Error »
MODx encountered the following error while attempting to parse the requested resource:
« PHP Parse Error »
 
PHP error debug
  Error: 	Undefined variable: charset	 
  Error type/ Nr.: 	Notice - 8	 
  File: 	/home/../domain.com/manager/includes/extenders/dbapi.mysql.class.inc.php	 
  Line: 	85	 
  Line 85 source: 	$charset = $charset ? $charset : $this->config['charset']; 	 
 
Parser timing
  MySQL: 	0.0000 s	(0 Requests)
  PHP: 	0.0998 s	 
  Total: 	0.0998 s	 
Error while inserting event log into database.

$charset = isset($charset) ? $charset : $this->config['charset'];