MyBB Community Forums

Recently I tried to click "Mark Forums Read" in the footer of several forums, and it resulted in this error:


As I am on my iPod, the site defaulted to MyBBGM, but it did the same thing in the full theme as well:


I believe all the forums are running 1.6.3, at least I know mine is.

Is this a MyBB-related bug?

Can someone please make a sticky about this?

But why is this happening? I did update my templates when I updated.
Guess I'll go add that code.