This issue has now been fixed. The latest version of the app (20.0.16) is no longer experiencing this crash!
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Our team found an issue that’s isolated to iOS 15 and is causing the app to crash if location services are used.
We’re looking into getting this fixed, but in the short term you can head to Settings → Apps → UDisc > Location and select ‘Never’ This will disable location services which means that some tools won’t be available to you but it will mean the app won’t crash.
We’ll update this post once the issue is fixed. Thanks for your patience with this!