diff --git a/src/sql/workbench/parts/notebook/browser/models/notebookInput.ts b/src/sql/workbench/parts/notebook/browser/models/notebookInput.ts
index a986574f15..c1b12a75f4 100644
--- a/src/sql/workbench/parts/notebook/browser/models/notebookInput.ts
+++ b/src/sql/workbench/parts/notebook/browser/models/notebookInput.ts
@@ -398,7 +398,7 @@ export class NotebookInput extends EditorInput {
 	}
 
 	public dispose(): void {
-		if (this._model) {
+		if (this._model && this._model.editorModel && this._model.editorModel.textEditorModel) {
 			this._model.editorModel.textEditorModel.onBeforeDetached();
 		}
 		this._disposeContainer();