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Null Reference exception on merging specific documents

Dear Support

On merging specific documents with docIO I get a nullReference exception inside docIo assembly.

It occurs only if I merge the files, which are attached to the post. So it must have something to do with the content of the documents.


With this exception is hard to give the user a feedback, what is wrong with their documents. But actually think  this is a bug and should not happen.


This is the code I am using to merge:

public GenericResponse<string> Compose(List<string> sourceFilePaths, string savePath)
{
    try
    {
        var destinationDoc = new WordDocument();

        foreach (var sourceFilePath in sourceFilePaths)
        {
            var sourceDoc = new WordDocument(sourceFilePath);
            sourceDoc.Sections[0].BreakCode = SectionBreakCode.NoBreak;
            destinationDoc.ImportContent(sourceDoc, ImportOptions.UseDestinationStyles);
            sourceDoc.Close();
        }

        destinationDoc.Save(savePath);
        destinationDoc.Close();

        return GenericResponse<string>.CreateSuccessResponse(savePath, "Documents successfully merged.");
    }
    catch (Exception e)
    {
        return GenericResponse<string>.CreateErrorResponse("Error while merging the documents.",
            "", e);
    }
}



Her is the stack Trace:

System.NullReferenceException: Object reference not set to an instance of an object.
   at Syncfusion.OfficeChart.Implementation.NameImpl.get_Columns()
   at Syncfusion.OfficeChart.Implementation.Charts.ChartSerieImpl.set_CategoryLabelsIRange(IRange value)
   at Syncfusion.OfficeChart.Implementation.Charts.ChartSerieImpl.Clone(Object parent, Dictionary`2 hashNewNames, Dictionary`2 dicFontIndexes)
   at Syncfusion.OfficeChart.Implementation.Charts.ChartSeriesCollection.Clone(Object parent, Dictionary`2 hashNewNames, Dictionary`2 dicFontIndexes)
   at Syncfusion.OfficeChart.Implementation.Charts.ChartImpl.Clone(Dictionary`2 hashNewNames, Object parent, Dictionary`2 dicFontIndexes)
   at Syncfusion.OfficeChart.Implementation.Charts.ChartImpl.Clone(Object parent)
   at Syncfusion.OfficeChart.Implementation.Charts.ChartImpl.Clone()
   at Syncfusion.DocIO.DLS.WChart.CloneImpl()
   at Syncfusion.DocIO.DLS.Entity.Clone()
   at Syncfusion.DocIO.DLS.ParagraphItemCollection.CloneItemsTo(ParagraphItemCollection items)
   at Syncfusion.DocIO.DLS.WParagraph.CloneParagraph(Boolean cloneItems)
   at Syncfusion.DocIO.DLS.WParagraph.CloneImpl()
   at Syncfusion.DocIO.DLS.Entity.Clone()
   at Syncfusion.DocIO.DLS.EntityCollection.CloneTo(EntityCollection destColl)
   at Syncfusion.DocIO.DLS.WTextBody.CloneImpl()
   at Syncfusion.DocIO.DLS.Entity.Clone()
   at Syncfusion.DocIO.DLS.WSection.CloneImpl()
   at Syncfusion.DocIO.DLS.Entity.Clone()
   at Syncfusion.DocIO.DLS.EntityCollection.CloneTo(EntityCollection destColl)
   at Syncfusion.DocIO.DLS.WordDocument.ImportContent(IWordDocument doc, ImportOptions importOptions)
   at xxx.xxx.DocumentManager.DocumentComposer.Compose(List`1 sourceFilePaths, String savePath) in D:\xxx\Operativ\BusinessApps\xxx\xxx.xxx\DocumentManager\xxx.cs:line 22



Attachment: DocumentComposer_becec840.7z

3 Replies
AN Anto Nihil Sahaya Raj Syncfusion Team May 23, 2022 04:54 PM UTC

Hi Patrick,

We have reproduced the reported issue with "NullReferenceException throws while importing content from one Word document to another"
in our end, and we suspect it to be a defect. We will validate this issue and update you with more details on or before 25th May 2022.

Regards,
Anto Nihil S


AN Anto Nihil Sahaya Raj Syncfusion Team May 24, 2022 12:49 PM UTC

Hi Patrick,

We have confirmed that the reported issue with “NullReferenceException throws while importing content from one Word document to another” is a defect and we have logged a defect report. We will include the fix for this defect in our weekly NuGet release which is estimated to be available on 31st May 2022.

The status of this bug can be tracked through the below link:
https://www.syncfusion.com/feedback/34963/exception-is-thrown-while-importing-content-from-one-word-document-to-another

Disclaimer: “Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization.”

Note: If you require a patch for the reported issue in any of our Essential Studio versions (except weekly release version), then kindly let us know the currently installed version, so that we can provide a patch in that version based on our SLA policy.

Regards,
Anto Nihil S


SB Suriya Balamurugan Syncfusion Team May 31, 2022 08:07 AM UTC

Hi Patrick,

As promised earlier, we have included the fix for the reported issue with “NullReferenceException throws while importing content from one Word document to another” in our latest weekly NuGet release (v20.1.0.58).

Please use the below link to download our latest weekly NuGet:
https://www.nuget.org/packages/Syncfusion.DocIO.Wpf/20.1.0.58

The status of this bug task can be tracked through the below link:
https://www.syncfusion.com/feedback/34963/exception-is-thrown-while-importing-content-from-one-word-document-to-another

Note: We will include this fix in our 2022 Volume 2 main release which will be available in end of June 2022.

Regards,
Suriya Balamurugan.


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