Odd error on XML import - 1366 Incorrect integer value

When I try and import an XML file from a URL using the exact settings found on this page: http://drupal.org/node/919448 I get a strange error.

After submitting the feed processor node, instead of importing my items, I get an error for every item that says:

SQLSTATE[HY000]: General error: 1366 Incorrect integer value: '12' for column 'last_comment_uid' at row 1

The integer value isn't always the same. It seems like a bug, as I did not map anything for column last_comment_uid, nor is it even an option when choosing my mapping settings. When creating the node type, I didn't create a column called last_comment_uid.

Anyway, as I followed the tutorial to a "T", I think there might be a bug somewhere? I have attached a screenshot of the configuration. From there, you can even grab the XML file from the URL field.