diff --git a/src/components/ConfigEditor.tsx b/src/components/ConfigEditor.tsx
index f73cfd20a..27bc68450 100644
--- a/src/components/ConfigEditor.tsx
+++ b/src/components/ConfigEditor.tsx
@@ -73,7 +73,7 @@ export function ConfigEditor(props: ConfigEditorProps) {
   }, [config]);
 
   useEffect(() => {
-    monaco?.json.jsonDefaults.setDiagnosticsOptions({
+    monaco?.json?.jsonDefaults?.setDiagnosticsOptions({
       validate: true,
       schemas: [
         {