Multiple recipients causes warning.

I get this message whenever an e-mail to multiple recipients is logged:

warning: mysqli_real_escape_string() expects parameter 2 to be string, array given in /Users/jjw/ashateam/drupal-6.20/includes/database.mysqli.inc on line 330.

To prevent this, I've modified the maillog_mail_send() function to check if $messge['to'] is an array, like this:

    $to = $messge['to'];
    if (is_array($to))
    	$to = implode(', ', $to);

later...

    $record->header_to = isset($to) ? $to : NULL;