[2019.2] External tool setting crashes preferences (Rider)

Platform: Arch Linux, UnityHub installation

After updating to 2019.2, new IDE integration package asks me to delete JetBrains.Rider.Unity.Editor.Plugin.Full.Repacked.dll from my existing project since it'll find it automatically from my filesystem.

After deleting the .dll file, the IDE integration package complains about not finding .dll file cause it's not looking in the right path. After digging around in RiderInitializer.cs, it's looking in the path "../../plugins/rider-unity/EditorPlugin". In order to find the .dll file properly, external tool setting should point directly to bin/rider.sh.

So I open up preferences and point external tool setting from rider.desktop to browse --> "/usr/share/rider/bin/rider.sh". Next thing I know preferences crashes with multiple errors. The preferences screens are empty. Even if I start a new project, errors are thrown immediately, and more errors are thrown when I open the preferences screen. I can't find the offending preference setting in .config/unity3d/ to rollback.

Any idea how I can reset the setting so I can at least continue working for now?

Some of the errors:

 

I fixed it by removing the key

<pref name="kScriptsDefaultApp" type="string"></pref>

from ~/.local/share/unity3d/prefs