Hi, our Xamarin.Forms app for Samsung Watch (Tizen) did not pass the review process to Samsung Store, because it crashed on startup. The log says:

System.NullReferenceException: Object reference not set to an instance of an object.
   at KTizen.App..ctor()
   at KTizen.Program.OnCreate()
   at Tizen.Applications.CoreBackend.UICoreBackend.OnCreateNative(IntPtr data)
   at Tizen.Applications.CoreBackend.UICoreBackend.Run(String[] args)
   at Tizen.Applications.CoreApplication.Run(String[] args)
   at Tizen.Applications.CoreUIApplication.Run(String[] args)
   at KomootTizen.Program.Main(String[] args)
Fatal error. 
Internal CLR error. (0x80131506)
   at Interop+Application.Main(Int32, System.String[], UIAppLifecycleCallbacks ByRef, IntPtr)
   at Tizen.Applications.CoreBackend.UICoreBackend.Run(System.String[])
   at Tizen.Applications.CoreApplication.Run(System.String[])
   at Tizen.Applications.CoreUIApplication.Run(System.String[])
   at KomootTizen.Program.Main(System.String[])
onSigabrt called

This seems to be an internal exception in the .NET Core itself / device firmware issue. How can we debug this? How can we fix it?

We have all our code in the contructor wrapped with a try/catch block, so technically it should never crash there.