Crash when logged in to Gamecenter

Since yesterday my game keeps crashing immediatly after starting the app. It only happens when I’m logged in to my Gamecenter account. Is this a bug in the game or in Gamecenter? And is there anything I can do to fix this, because it’s really anoying to have to log out of Gamecenter everytime I want to play the game.

I’m using an iPhone 5S with ios 7.0.4

The admins might want to take a look at this. Don’t know how to help you bud.