Xamarin Android app Nullreference issue after API

Job ID: 33905783

Budget: €30 – €250 EUR

System.NullReferenceException: 'Object reference not set to an instance of an object.' when doing a JsonConvert.SerializeObject();

We get the above error in our C# Xamarin.Android app on older Android devices using Android 8.0 or earlier.

Problem raised after we had to update everything to be able to use Android API level 30.
The same code compiled with the very same API, works on newer android devices.

we need help to troubleshoot using TeamViewer or similar.
Related categories: JSON Xamarin Android App Development Android SDK