diff --git a/server/app/api/controller/GameController.php b/server/app/api/controller/GameController.php
index f3d6f37..edadbcf 100644
--- a/server/app/api/controller/GameController.php
+++ b/server/app/api/controller/GameController.php
@@ -71,7 +71,7 @@ class GameController extends OpenController
     {
         $userId = (int) ($request->player_id ?? 0);
         $rediction = $request->post('rediction');
-        if ($rediction === '' || $rediction === null) {
+        if (empty($rediction)) {
             return $this->fail('请传递 rediction 参数', ReturnCode::PARAMS_ERROR);
         }
         $direction = (int) $rediction;