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When I type <enter> in an SfAutoComplete control after typing a word which does not exist in the dictionary (and getting "No Results Found" in the drop down, see the attached screenshot) I get an argument out of range exception with this call stack:

System.Private.CoreLib.dll!System.Runtime.InteropServices.WindowsRuntime.VectorToListAdapter.Indexer_Get<object>(int index) Line 37
at E:\A\_work\252\s\src\mscorlib\src\System\Runtime\InteropServices\WindowsRuntime\VectorToListAdapter.cs(37)
Syncfusion.SfInput.UWP.dll!Syncfusion.UI.Xaml.Controls.Input.SfTextBoxExt.OnKeyDown(Windows.UI.Xaml.Input.KeyRoutedEventArgs e = {Windows.UI.Xaml.Input.KeyRoutedEventArgs})

The source for the VectorToListAdapter method checks for a negative index ...

        internal T Indexer_Get<T>(int index)
            if (index < 0)
                throw new ArgumentOutOfRangeException(nameof(index));
so I guess the SfAutoComplete is not checking for that before using the index.

BTW I have version, but it's not in the dropdown. Nuget from Syncfusion_Xamarin says this is the latest version available to me.