diff --git a/packages/cascader/src/main.vue b/packages/cascader/src/main.vue
index 9cf93c1bd..c1d743a4a 100644
--- a/packages/cascader/src/main.vue
+++ b/packages/cascader/src/main.vue
@@ -142,7 +142,7 @@ export default {
     },
     beforeFilter: {
       type: Function,
-      default: null
+      default: () => (() => {})
     }
   },