Exception from Word.ApplicationClass.Activedocument all of a sudden

Question

I have this single line of code in a Word VSTO add-in project which used to work but suddenly doesn\'t anymore:

Microsoft.Office.Interop.Word.Document doc =          


        

Answer 1

From my experience : when i was closing the Active Document at that time i was refreshing Ribbon Menu according to the active document. If the closing document was the Last document i wasn't able to read any property of

Microsoft.Office.Interop.Word.Document doc = Globals.ThisAddIn.Application.ActiveDocument;

and i was facing the same issue like you.

whenever i close any document i check

if(Globals.ThisAddIn.Application.Documents.Count = 1){ 
LastActiveDocument = true;
}

And when i refresh the Ribbion Menu i check

if(!LastActiveDocument){
// then only read any property of Active document
}