diff --git a/src/controllers/game.controller.ts b/src/controllers/game.controller.ts
index 7048958..586175c 100644
--- a/src/controllers/game.controller.ts
+++ b/src/controllers/game.controller.ts
@@ -39,8 +39,8 @@ class GameController extends BaseController {
     const existsSet = new Set()
     exists.forEach(record => {
       // @ts-ignore
-      let dateTag = record.data?.dateTag || formatDate(record.createdAt)
-      existsSet.add(dateTag)
+      let _dateTag = record.data?.dateTag || formatDate(record.createdAt)
+      existsSet.add(_dateTag)
     })
     if (existsSet.has(dateTag)) {
       throw new ZError(12, 'already claimed')