diff --git a/components/menu/src/Menu.tsx b/components/menu/src/Menu.tsx
index 006025fc8..f695d2653 100644
--- a/components/menu/src/Menu.tsx
+++ b/components/menu/src/Menu.tsx
@@ -339,7 +339,7 @@ export default defineComponent({
     };
 
     const onInternalOpenChange = (key: Key, open: boolean) => {
-      const childrenEventKeys = keyMapStore.value[key].childrenEventKeys;
+      const childrenEventKeys = keyMapStore.value[key]?.childrenEventKeys || [];
       let newOpenKeys = mergedOpenKeys.value.filter(k => k !== key);
 
       if (open) {