diff --git a/package.json b/package.json
index c213034b..70b5e9cc 100644
--- a/package.json
+++ b/package.json
@@ -65,6 +65,7 @@
     "@babel/runtime": "^7.12.5",
     "array-tree-filter": "^2.1.0",
     "classnames": "^2.3.1",
+    "rc-select": "~13.2.1",
     "rc-tree-select": "~4.8.0",
     "rc-trigger": "^5.0.4",
     "rc-util": "^5.6.1",
diff --git a/src/util.ts b/src/util.ts
index 31985cd6..2db1897b 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -7,6 +7,7 @@ import type {
   InternalDataNode,
   OptionDataNode,
 } from './interface';
+import { toArray } from 'rc-select/lib/utils/commonUtil';
 
 const VALUE_SPLIT = '__RC_CASCADER_SPLIT__';
 
@@ -53,7 +54,7 @@ export function isLeaf(option: OptionDataNode) {
  * zombieJ: It's better to deprecate the same key in the nest tree. Maybe next major version.
  */
 export function connectValue(value: React.Key[]) {
-  return (value || []).join(VALUE_SPLIT);
+  return toArray(value).join(VALUE_SPLIT);
 }
 
 /**