App Hangs After Splashscreen

I have built an app with device specific security options. The app launchs on multiple devices without problem. On some devices It hangs after splash screen. You will see nothing Except white screen. In some devices turning on storage and phone permission by going to device’s setting will solve the problem. This problem happened on SAB 8.0.1 and 8.1.

Any clue?

Sorry, this is a bug. When you see the white screen it should be showing you a message box about permissions. It has been fixed for the next version of Scripture App Builder.