[Bug] NREs still occur in XF

[charlesroddie]

NREs still occur in XF, 2 YEARS after the solution (NRTs) was rolled out across .Net.
Serious mismanagement.

iOS crash report:

NavigableElement.OnParentSet ()
SIGABRT: Object reference not set to an instance of an object.

NavigableElement.OnParentSet ()
Element.set_Parent (Xamarin.Forms.Element value)
Element.OnChildAdded (Xamarin.Forms.Element child)
VisualElement.OnChildAdded (Xamarin.Forms.Element child)
Layout`1[T].OnChildAdded (Xamarin.Forms.Element child)
Layout.OnInternalAdded (Xamarin.Forms.View view)
Layout.InternalChildrenOnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
(wrapper delegate-invoke) <Module>.invoke_void_object_NotifyCollectionChangedEventArgs(object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)
ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index)
ObservableCollection`1[T].InsertItem (System.Int32 index, T item)
Collection`1[T].Add (T item)
ObservableWrapper`2[TTrack,TRestrict].Add (TRestrict item)
Grid+GridElementCollection.Add (Xamarin.Forms.View view, System.Int32 left, System.Int32 right, System.Int32 top, System.Int32 bottom)
Grid+GridElementCollection.Add (Xamarin.Forms.View view, System.Int32 left, System.Int32 top

[rachelkang]

Hi @charlesroddie - thanks for submitting this issue. Would you be able to share your project or a sample project reproducing the issue so that we can take a closer look? In what scenario(s) are you seeing these NREs thrown? Are they also causing crashes?

[charlesroddie]

@rachelkang thanks for asking and sorry for the very slow reply.

This is a crash report on iOS. It's very sporadic. Nothing that we have reproduced internally.

The cause is that NRTs are not enabled in the Xamarin.Forms repo so errors like this are expected.