LVL 0 Nameless person arena

MikkyX

So I have a character on another server who I forgot or left abandoned because I was playing on another server.  I went back to check on my old character I made in another server and I noticed that in front of me there's a level 0 person who has no name in arena.  I challenged him/her but I just couldn't.  It didn't let me.  I found it weird that a lvl 0 person without name be in arena.  

Could be a bug.  Anybody encounter anything similar?