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This bug is also reported but as a comment. As we really need it resolved in your next release, I am posting it in a separate new thread as it is a different crash location. https://www.syncfusion.com/feedback/7093/crash-specially-after-repetitive-loads In 

Xamarin.Form UWP apps, SfPdfViewer crashes. Following is the error information and Stack Trace. 

Value does not fall within the expected range.

   at Windows.Data.Pdf.PdfDocument.GetPage(UInt32 pageIndex)

   at Syncfusion.SfPdfViewer.XForms.UWP.PdfDocumentView.LoadPages()

   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<>c.<ThrowAsync>b__7_0(Object state)

   at System.Threading.WinRTSynchronizationContextBase.Invoker.InvokeCore()