diff --git a/packages/next/src/__builtins__/hooks/usePrefixCls.ts b/packages/next/src/__builtins__/hooks/usePrefixCls.ts
index 7409ba7b652..657a91013f8 100644
--- a/packages/next/src/__builtins__/hooks/usePrefixCls.ts
+++ b/packages/next/src/__builtins__/hooks/usePrefixCls.ts
@@ -8,5 +8,5 @@ export const usePrefixCls = (
 ) => {
   const getContext = ConfigProvider['getContext']
   const prefix = props?.prefix ?? getContext()?.prefix ?? 'next-'
-  return `${prefix}${tag}`
+  return `${prefix}${tag ?? ''}`
 }