When you click on "info" from a user page without the author field in the URL, the script doesn't seem to be able to find the user you're looking for. For example, when you look at this comic and click "info," it breaks, but if you look at the same comic with the only difference being the author field in the URL, it works just fine.

Wierd, huh?

It was assuming there should always be an author variable in the URL. It's fixed now though.