diff --git a/packages/react-simulator-renderer/src/renderer.ts b/packages/react-simulator-renderer/src/renderer.ts
index 20cdbeba2..92ff55443 100644
--- a/packages/react-simulator-renderer/src/renderer.ts
+++ b/packages/react-simulator-renderer/src/renderer.ts
@@ -551,7 +551,7 @@ function cacheReactKey(el: Element): Element {
   }
   REACT_KEY = Object.keys(el).find(
     (key) => key.startsWith('__reactInternalInstance$') || key.startsWith('__reactFiber$'),
-  );
+  ) || '';
   if (!REACT_KEY && (el as HTMLElement).parentElement) {
     return cacheReactKey((el as HTMLElement).parentElement!);
   }