Unsupported operand types error when mimemail enabled

When I enable mimemail module, the email is never sent and I have a white page. I have this error in log : PHP Fatal error: Unsupported operand types in includes/theme.inc on line 1087

The error comes from arguments when theme_webform2pdf_mail2pdf function is called line 583 : Instead of

  $attachment->filecontent = theme('webform2pdf_mail2pdf', $webform2pdf_send2pdf['nid'], $webform2pdf_send2pdf['sid']);

these should be

$attachment->filecontent = theme('webform2pdf_mail2pdf', array('nid'=>$webform2pdf_send2pdf['nid'], 'sid'=> $webform2pdf_send2pdf['sid']));

Here is the patch for this.