Only crashing on Testflight

We're using TestFlight to send out pilots of our app.

There's a part of the app that is crashing, and we had a lot of trouble reproducing the crash. The code their is fairly simple.

It turns out that the users who got the App via TestFlight get the crash, while if you build the app and install it using the IDE it doesn't crash!

Anyone have ideas about what might be causing this?

Any ideas for workarounds? We don't want to stop using TestFlight.

Why is my app suddenly crashing?

If your Android apps keep crashing or freezing it's usually because you're low on space or running too many apps at once. Other reasons for crashing apps include a spotty Wi-Fi connection or an old version of the app that hasn't been updated.

Is there a limit on TestFlight users?

TestFlight makes it easy to invite users to test your apps and App Clips and collect valuable feedback before releasing your apps on the App Store. You can invite up to 10,000 testers using just their email address or by sharing a public link.

Make sure to build your app in Release Mode not in Debug. The app may only crash when in Release.