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Vote

PDF merge with PDFs containing fillable forms throws NullReferenceException

Please see the attached sample project including some PDFs for validation.

Merge with PDFs without fillable forms works. But if the merged PDF contains a fillable form the following exception is thrown:


System.NullReferenceException
  HResult=0x80004003
  Message=Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
  Source=Syncfusion.Pdf.Base
  StackTrace:
   at Syncfusion.Pdf.IO.PdfCrossTable.GetReference(IPdfPrimitive obj, Boolean& bNew)
   at Syncfusion.Pdf.Parsing.PdfLoadedStateField.GetItemValue(PdfDictionary dictionary, PdfCrossTable crossTable)
   at Syncfusion.Pdf.Parsing.PdfLoadedStateField.ApplyAppearance(PdfDictionary widget, PdfLoadedStateItem item)
   at Syncfusion.Pdf.Parsing.PdfLoadedCheckBoxField.BeginSave()
   at Syncfusion.Pdf.Interactive.PdfForm.CheckFlatten()
   at Syncfusion.Pdf.Interactive.PdfForm.Dictionary_BeginSave(Object sender, SavePdfPrimitiveEventArgs ars)
   at Syncfusion.Pdf.Primitives.PdfDictionary.OnBeginSave(SavePdfPrimitiveEventArgs args)
   at Syncfusion.Pdf.Primitives.PdfDictionary.Save(IPdfWriter writer, Boolean bRaiseEvent)
   at Syncfusion.Pdf.Primitives.PdfDictionary.Save(IPdfWriter writer)
   at Syncfusion.Pdf.IO.PdfArchiveStream.SaveObject(IPdfPrimitive obj, PdfReference reference)
   at Syncfusion.Pdf.IO.PdfCrossTable.DoArchiveObject(IPdfPrimitive obj, PdfReference reference, PdfWriter writer)
   at Syncfusion.Pdf.IO.PdfCrossTable.SaveIndirectObject(IPdfPrimitive obj, PdfWriter writer)
   at Syncfusion.Pdf.IO.PdfCrossTable.SavePrimitive(IPdfPrimitive obj, PdfWriter writer)
   at Syncfusion.Pdf.IO.PdfCrossTable.SaveObjects(PdfWriter writer)
   at Syncfusion.Pdf.IO.PdfCrossTable.Save(PdfWriter writer)
   at Syncfusion.Pdf.PdfDocument.Save(Stream stream)
   at Syncfusion.Pdf.PdfDocumentBase.Save(String filename)
   at SyncfusionMergePdf.Program.Main(String[] args) in D:\Temp\Syncfusion\SyncfusionMergePdf\SyncfusionMergePdf\Program.cs:line 34