I was hoping someone can put me on a right track with my issue.
I developed this android app with target sdk 30 and min sdk 16. During the development I was using Android 9 (sdk 28) for test purposes and everything worked well. This app is meant to be used internally in my father's small business, so I didn't put this up on Play Store. I built .apk file instead and installed on my father's phone with Android 10 (sdk 29) and tried to run. It turned out that the app crashes without any error. The phone's screen just flashes for 0.1 sec and the app crashes. Then I tried to install the app on another (older) phone with Android 8 (sdk 27) but the app crashes as well.
My another guess was phone language - as I was testing the app on phone with English set and my father's phone had set Polish as default, but on testing phone after the language change the app still works and on my father's phone after the language change to English still crashes.
Does anyone have any idea what the issue can be? Has anybody run into this issue before?
Any suggestions would be much appreciated.