In the Ask a Super User Moderator chat room, when someone clicks on tag:moderator*, a page not found error is reached.
Problem solved: I removed the tag from the chat room.
This is expected behavior. There is no moderator or
moderator-* tag on Super User, so naturally there is no tag wiki for it. I'm not sure why the tag was added in the first place, but I've since removed it so it won't be a problem any more.