Saxon

In file Xslt.cs, initialContextNode throws exception if null i.e. initialContextNode.getRoot();

I think this issue was introduced in 9.8.0.4:

    public XdmNode InitialContextNode

    {

        get { return (initialContextNode == null ? null : (XdmNode)XdmValue.Wrap(initialContextNode)); }

        set { initialContextNode = (value == null ? null : (JNodeInfo)value.Unwrap());

            JNodeInfo doc = **initialContextNode.getRoot();** 

            if (doc != null)

            {

                controller.registerDocument(doc.getTreeInfo(), (doc.getBaseURI() == null ? null : new JDocumentURI(doc.getBaseURI())));

            }

            controller.setGlobalContextItem(doc);

        }

    }