Here is the crash report and the crash is only happening on iOS 13 beta version :-
Crashed: com.apple.main-thread
0 libsystem_pthread.dylib 0x1ae05
I've the same issue on iOS 13 and it's my most serious crash on Crashlytics. It occurs only in iOS 13 and above. Unfortunately also in the latest 13.1.2.
Starting by the iOS 13 release I've detected a strange warning when I put my app in background the debug console print Can't end BackgroundTask: no background task exists with identifier x, or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug.
Maybe the issues are related.