Fun, but crashes.

Its a great game but for some reason, if it crashes once, then every time I open the app it keeps crashing whenever the title screen comes up!

It seems like it crashes when I go back from the menu to choose my car. Im using an iPhone 5 iOS version 7.0.2 if it helps to fix the problem any.

AmunUnknownester about I Hate Zombies™, v1.5