UPDATE! This was fixed in version 1.3.1. Please update the app to the latest version from the app store.
Several players have reported crashing when trying to use the "Get 5 free attempts" option. We apologize for this continued issue and are actively working on it. It is related to the ad network we use. Reinstalling the app should resolve the issue but unless you have another device with your game synced up you wont be able to restore your game from the cloud, so we don't suggest going that route unless you are syncing first. We are working on an update to resolve this issue.