"Dead" games in Active Games

I’ve got a “dead” game in my Active Games. The game already ended but it’s still there. I also get the notification (small black circle with “1” in the upper right corner) that it’s supposed to be my turn.

This is especially weird because I didn’t even actually participate in that game. The game was played by two other players but I guess me and one of the players accepted the challenge at exactly the same time or something.

How can I get rid of the game and the notification?