[CLIENT] Mastery Bug

I was looking at a friend's masteries when I returned to my game lobby. When I tried to choose a mastery page I kept getting different pages that belonged to my friend's account. When this happened an error message appeared stating "A Suitable error message could not be found." I couldn't choose my masteries without this error occurring but restarting the lobby solved the problem.

I tried recreating the bug and it was the same each time.