diff --git a/public/react/src/modules/page/component/monaco/TPIMonaco.js b/public/react/src/modules/page/component/monaco/TPIMonaco.js
index c16e5eb65..615623cd1 100644
--- a/public/react/src/modules/page/component/monaco/TPIMonaco.js
+++ b/public/react/src/modules/page/component/monaco/TPIMonaco.js
@@ -246,7 +246,7 @@ class TPIMonaco extends Component {
         } 
     }
     componentWillUnmount() {
-        editor_monaco.dispose()
+        this.editor_monaco && this.editor_monaco.dispose()
     }
     
 	componentDidMount() {