We understand that you are facing the app crash issue on the app, please clear the cache and force close reopen the app to see if it helps. Make sure you are using the latest version of the app, if you still facing the issue after this, please contact the support to help you better with this.
As per Google, follow the steps to force close the app from the background apps:
- Open the Settings App on your device.
- Scroll down and tap on 'Application Manager'.
- Scroll down in the 'Downloaded' list and tap the Rewarded Play/Beauty reward/Football rewards app.
- Tap 'Force Stop' to fully close the application on your device.
Also, please restart your device and see if that helps.