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We have a few users running into this exception. It appears related to tapping on an item of a listview and being unable to resolve the underlying binding object.
Xamarin.Forms.ListProxy.TryGetValue(int index, ref object value)
Xamarin.Forms.TemplatedItemsList<TView, TItem>.get_Item(int index)
Xamarin.Forms.ListView.NotifyRowTapped(int groupIndex, int inGroupIndex, Cell cell)
Xamarin.Forms.ListView.NotifyRowTapped(int index, Cell cell)
Xamarin.Forms.Platform.Android.ListViewAdapter.HandleItemClick(AdapterView parent, View view, int position, long id)
Xamarin.Forms.Platform.Android.CellAdapter.OnItemClick(AdapterView parent, View view, int position, long id)
Android.Widget.AdapterView.IOnItemClickListenerInvoker.n_OnItemClick_Landroid_widget_AdapterView_Landroid_view_View_IJ(IntPtr jnienv, IntPtr native__this, IntPtr native_parent, IntPtr native_view, int position, long id)
at (wrapper dynamic-method) System.Object:e3e592cc-316c-414c-ba5d-79cae0684334 (intptr,intptr,intptr,intptr,int,long)
Thank you for taking the time to submit the bug. We tried to reproduce the issue you reported but were unable given the description. If you could please attach a reproduction to the bug by starting with a clean Xamarin.Forms project and adding just the code necessary to demonstrate the issue, we would very much appreciate it.
For your convenience, we have created some reproduction best practices viewable here: https://gist.github.com/jassmith/92405c300e54a01dcc6d
Xamarin Forms Team
Because we have not received a reply to our request for more information we are closing this issue. If you are still encountering this issue, please reopen the ticket with the requested information. Thanks!