I can perfectly remember having seen this before..
I am even positive this has been repaired...
but just found it on my pages.. and to double check.. i went to zachs pages..
AND... its still there..
When a user inputs a wrong category.. he gets the normal error message.. and then the adminlink.. (contact admin bla bla) check that link..
Live examples (click the administrator link when you get the errormessage):
the admin link is for example:
very strange.. i am positive it had been fixed long long time ago..
PS: probably the adminlink has probs in other places also.. didnt check..