diff --git a/src/DynamoCoreWpf/ViewModels/Core/AnnotationViewModel.cs b/src/DynamoCoreWpf/ViewModels/Core/AnnotationViewModel.cs
index 62cf5a5bafd..1e68909988b 100644
--- a/src/DynamoCoreWpf/ViewModels/Core/AnnotationViewModel.cs
+++ b/src/DynamoCoreWpf/ViewModels/Core/AnnotationViewModel.cs
@@ -1257,7 +1257,7 @@ private void UpdateAllGroupedGroups()
                     {
                         ViewModelBases
                             .OfType<AnnotationViewModel>()
-                            .ToList()
+                            .ToList()?
                             .ForEach(x => UpdateGroupCutGeometry(x));
                     }
                 }