Exception creating FragmentContainer when using AppCompat activity

My users are reporting this exception a lot:

Managed exception: Unable to find the default constructor on type Xamarin.Forms.Platform.Android.AppCompat.FragmentContainer. Please provide the missing constructor.

This only happened once I started using the new AppCompat activity for Android.

I believe this happens when users switch out of the app then back to it. Any idea where this could be happening?

I know that this exception happens when some constructors are missing that Xamarin needs, but this type FragmentContainer is an internal type, I cannot change its code.

Thanks,
Space Monkey