Crash when changing notification settings

[dreeves]

Desiderata

Beta Give feedback

1. Confirm the replicata
2. Fix it
3. Add it to the changelog for the next release

User's app is crashing when they try to change notification settings:

When I try to change my notification settings in the iOS app, the app crashes. This happened the first time I tried changing the settings in the app, and I also tried disabling and re-enabling notifications for the app in system notification settings, and the app still crashes.

Replicata

1. Choose a goal in the app notification settings screen
2. Change value in "notify x days before derail"
3. Navigate back to the previous screen

Expectata

That the app not quit.

Resultata

You guessed it, the app quits.

Verbata: user-reported bugs, crashes, notification settings,

[krugerk]

Possibly a duplicate of #172