Error when user cancels account

Hi,

I'm receiving an error after a user clicks on the cancel account confirmation that is emailed to them. Furthermore, the user is set to be blocked and have their content unpublished after cancelling their account, but because of the error, their account is not block and content remains published. Here's part of the error i'm getting, it seems to repeat:

An AJAX HTTP error occurred. HTTP Result Code: 200 Debugging information follows. Path: /batch?id=75&op=do StatusText: OK ResponseText: SMTP -> get_lines(): $data was "" SMTP -> get_lines(): $str is "220 mx.google.com ESMTP k9sm41998329pbl.18 " SMTP -> get_lines(): $data is "220 mx.google.com ESMTP k9sm41998329pbl.18 " SMTP -> FROM SERVER:220 mx.google.com ESMTP k9sm41998329pbl.18 SMTP -> get_lines(): $data was "" SMTP -> get_lines(): $str is "250-mx.google.com at your service, [MY IP ADDRESS] " SMTP -> get_lines(): $data is "250-mx.google.com at your service