Looks like this is fixed in the 9.17.0.38671 beta build (9.17.0.38689 is the current beta).
You can download the APK from the announcement thread and sideload.
You can join the beta program: https://play.google.com/apps/testing/com.plexapp.android
Plex for Android 9.17.0.38671-beta
FIXES:
- [TV] App could crash trying to display settings screen.
