Xamarin.Forms 4.2 incompatibility?

Hello,

when I update Xamarin Forms from v4.1.0.709244 to v4.2.0.709249 the app started crashing right away on launch with this exception:

Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object.

at Xamarin.Forms.Platform.Android.AppCompat.Platform.op_Implicit (Xamarin.Forms.Platform.Android.AppCompat.Platform canvas) [0x00000] in \a\1\s\Xamarin.Forms.Platform.Android\AppCompat\Platform.cs:491
at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.OnDestroy () [0x0002f] in \a\1\s\Xamarin.Forms.Platform.Android\AppCompat\FormsAppCompatActivity.cs:221
at Android.App.Activity.n_OnDestroy (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in :0
at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.9(intptr,intptr)

It crashes before it hits any line of code, so i am clueless.
Any ideas?

Thank you!