Lobby client: rejoining to room with unknown map bugs a lot

[TradeMark]

When i rejoined to room where was selected a map which i didnt have, it gave me this error (under that small popup).
And when i pressed "send report" button, it gave that small popup error.

Edit: I tested it now, and that error comes always when i rejoin to game where is a map which i dont have.

Edit: When this happens, i cant leave that room, and they cant kick me :D, i can still see their talking.