check if EditorAdaptersFactoryService gives us a null buffer

fixes dotnet#43495
jmarolf · Jul 30, 2020 · 69937f8 · 69937f8
1 parent 75af7e1
commit 69937f8
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/VisualStudio/Core/Def/Implementation/Workspace/VisualStudioActiveDocumentTracker.cs b/src/VisualStudio/Core/Def/Implementation/Workspace/VisualStudioActiveDocumentTracker.cs
@@ -228,7 +228,7 @@ public FrameListener(VisualStudioActiveDocumentTracker service, IVsWindowFrame f
                     {
                         _textBuffer = _documentTracker._editorAdaptersFactoryService.GetDocumentBuffer(bufferAdapter);
 
-                        if (!_textBuffer.ContentType.IsOfType(ContentTypeNames.RoslynContentType))
+                        if (_textBuffer != null && !_textBuffer.ContentType.IsOfType(ContentTypeNames.RoslynContentType))
                         {
                             _textBuffer.Changed += NonRoslynTextBuffer_Changed;
                         }