ListView bound to ObservableCollection crash

I have ListView bound to an ObservableCollection. When I do ObservableCollection.Clear() it crashes/throwing with a NullReferenceException in Source: "Xamarin.Forms.Core" at "Xamarin.Forms.VisualElement.get_BackgroundColor ()...".
In the Forum I found many issues regarding ListView and ObservableCollection. Are there any workarounds for that problem?
(Xamarin Forms Version 1.4.4.6392)

Thanks