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System.ArgumentOutOfRangeException when saving a pdf containing a combobox without selected item

Hi, if the pdfviewer contains a combobox without a selected item then the SaveDocument methods fail with a System.ArgumentOutOfRangeException.

Sample code:
PdfDocument document = new PdfDocument();
PdfPage page = document.Pages.Add();
PdfComboBoxField comboBoxField = new PdfComboBoxField(page, "JobTitle");

comboBoxField.Bounds = new Syncfusion.Drawing.RectangleF(0, 40, 100, 20);
comboBoxField.Items.Add(new PdfListFieldItem("Development", "accounts"));
comboBoxField.Items.Add(new PdfListFieldItem("Support", "advertise"));
comboBoxField.Items.Add(new PdfListFieldItem("Documentation", "content"));
document.Form.Fields.Add(comboBoxField);

MemoryStream stream = new MemoryStream();
document.Save(stream);
stream.Position = 0;
pdfViewerControl.DocumentSource = stream;


var stream = new MemoryStream();
//await pdfViewerControl.SaveDocumentAsync(stream);
pdfViewerControl.SaveDocument(stream);   => 

System.ArgumentOutOfRangeException