Crash Occurs When Rotating Phones in Settings Menu

Expected Behavior

Settings menu reorients to new view when the phone is rotated.

Actual Behavior

Rotating the phone while in the Settings menu crashes the application.

How to Reproduce

1. Launch OpenPad 1.5.1 on Android 8.1.0
2. Click the Settings icon in upper right
3. Rotate the Phone

Device: Pixel 2 XL
OS: Android 8.1.0
App Version: 1.5.1

Recording of the Bug