The app works perfectly in debug. However in testflight, when cellular network is enabled, the app randomly crashes just after receiving an api response. The api response provides a text response, in json format. This text response is updated on the screen using a completion handler from the api call. I have tried debugging to the best of my ability, but I can't figure out why (a) the crash is random, (b) only occurs in testflight, and (c) only occurs when cellular network is enabled on the iphone (ios13 -- no crashes when using wifi).