Buffer cannot be null

We are using DynamicPDF For .NET (4.0)  version 7.0.1.40
This code is throwing an exception.

 private MergeDocument CombineFiles(IPrint[] docs)
    {
        MergeDocument mergedDoc = new MergeDocument();

        foreach (IPrint pdfPrinter in docs.Where(doc => doc.DocumentType == DocType.PDF | doc.DocumentType == DocType.DOCXasPDF))
 
            mergedDoc.Append(new PdfDocument(pdfPrinter.Document));

        return mergedDoc;
    }

Exception occurred: Buffer cannot be null.
Parameter name: buffer    at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable)

Please advise.

Hi,

What is the data type of pdfPrinter.Document? If it is a byte array, please ensure it does not have a value of null.

Thanks,
ceTe Software Support Team