Fatal error: Uncaught exception 'ezcBasePropertyNotFoundException' with message 'No such property name 'subType'.'

I'm using 2.1.4, however, with the CiviMailProcessor code... When running the script to process emails via the CiviCRM Mail Processor some emails fail with a fatal error and prevent the script from completing:

Fatal error: Uncaught exception 'ezcBasePropertyNotFoundException' with message 'No such property name 'subType'.' in /var/www/x.org/sites/all/modules/civicrm/packages/ezc/Mail/src/interfaces/part.php:118 Stack trace: #0 /var/www/x.org/sites/all/modules/civicrm/packages/ezc/Mail/src/parts/delivery_status.php(101): ezcMailPart->_get('subType') #1 /var/www/x.org/sites/all/modules/civicrm/bin/CiviMailProcessor.php(77): ezcMailDeliveryStatus->_get('subType') #2 /var/www/x.org/sites/all/modules/civicrm/bin/CiviMailProcessor.php(141): CiviMailProcessor->process() #3

{main}

thrown in /var/www/x.org/sites/all/modules/civicrm/packages/ezc/Mail/src/interfaces/part.php on line 118

I contacted ez Components and they said that only the ezcMailText property has SubParts. Thus, inserting the check: if ( $part instanceof ezcMailText ) {... fixes this issue as far as I am concerned. Here is the chunk of code below from CiviMailProcessor.php (sorry, I don't have a good patch utility on this machine):

// for bounces and replies get the plaintext and HTML parts of the message
// FIXME: this assumes only one plain and one html part per message (and discards the rest)
if (in_array($action, array('b', 'bounce', 'r', 'reply'))) {
$text = $html = null;
if ($mail->body instanceof ezcMailText)

{ $text = $mail->body->text; }

elseif ($mail->body instanceof ezcMailMultipart) {
foreach ($mail->body->getParts() as $part) {
if ( $part instanceof ezcMailText ) {
switch ($part->subType)

{ case 'plain': $text = $part->text; break; case 'html': $html = $part->text; break; }

}
}
}
}