Third time adding cloned section: "Object reference not set to an instance of an object"

Aspose.Words Product Family
1

Hello -
This code:

Aspose.Words.License license = new Aspose.Words.License();
license.SetLicense("Aspose.Words.lic");
Aspose.Words.Document doc = new Aspose.Words.Document(@"s:\Replacement tokens.doc");
// Get a copy of the first section in the doc so it can be appended to the doc.
Aspose.Words.Section sectionTemplateSource = doc.Sections[0].Clone();
for (int i = 0; i < 5; ++i)
{
    // If we're not at the first section, append the first section to the doc.
    if (i > 0)
        doc.Sections.Add(sectionTemplateSource);
}

…fails when line 28, the one containing doc.Sections.Add, is executed the third time. The error I receive is:

Object reference not set to an instance of an object.
at Aspose.Words.CompositeNode.RemoveChild(Node oldChild)
at Aspose.Words.CompositeNode.࠮(Node ࠘, Node ࠯, Boolean ࠰)
at Aspose.Words.CompositeNode.InsertAfter(Node newChild, Node refChild)
at Aspose.Words.CompositeNode.AppendChild(Node newChild)
at Aspose.Words.NodeCollection.Add(Node node)
at webforms_AsposeTest.Page_Load(Object sender, EventArgs e) in c:\My Projects\BSI Working\EasyOperator\OperatorMarketing\webforms\AsposeTest.aspx.cs:line 28
at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

I’ve attached the document referenced in the code.
Do I need to do something different? Please advise.
Thanks,
Daren

2

Hello!
Thank you for your inquiry.
Document.Sections.Add doesn’t clone source section itself. It just adds what you specify. Please ensure you have one more distinct object before every addition.
Regards,