There a chat user who has no valid parent user. It is indicated that his chat account is associated to a Maths.SE account, which does not appear to exist. The user was still able to chat.
Is it normal? If it's a bug, could someone look into it?
Edit: if you browse the Google cache for users named Skullpatrol, it turns out a single series of associated accounts. The user is now named Rob. I don't know what went wrong, maybe an account merge or something like that, but it needs someone from staff looking into it with some superpowers.
I also tried to update the parent user of the chat account to this "Rob" profile, but the interface goes all buggy on me (works for other users, fails only for this one):