diff --git a/src/DynamoCoreWpf/ViewModels/Core/WorkspaceViewModel.cs b/src/DynamoCoreWpf/ViewModels/Core/WorkspaceViewModel.cs
index 8a8d870af88..2c410c077f4 100644
--- a/src/DynamoCoreWpf/ViewModels/Core/WorkspaceViewModel.cs
+++ b/src/DynamoCoreWpf/ViewModels/Core/WorkspaceViewModel.cs
@@ -573,7 +573,7 @@ public override void Dispose()
             Errors.Clear();
             Annotations.Clear();
             InCanvasSearchViewModel?.Dispose();
-            NodeAutoCompleteSearchViewModel.LuceneUtility.DisposeAll();
+            NodeAutoCompleteSearchViewModel.LuceneUtility?.DisposeAll();
             NodeAutoCompleteSearchViewModel?.Dispose();
         }