I have a Xamarin Forms PCL project with some sfNumericTestBoxes.
Using VS 2017, Xamarin Forms 18.104.22.1686, sfNumericTextBox 22.214.171.124.
When a sfNumericTextBox has input focus and the Enter key on an iPhone/iPad keyboard is pressed the app crashes with an NullReferenceException, see debug output below. ( No problems on Android and UWP).
Attached is a demo app I downloaded from Syncfusion forums, the crash also happens here.