First, please make sure you are on our latest update! You can do this by going to the Google Play Store or the App Store and making sure our app is up to date.
Try force closing the app for 1-2 mins to see if this fixes the issue with the app crashing.
Minimum OS (Operating Systems) version for Android devices is 7.0.
If you still need help please contact support through the app or firstname.lastname@example.org with your player ID number.