diff --git a/app/api/service/passport/Login.php b/app/api/service/passport/Login.php
index 49e7f983..425922b6 100644
--- a/app/api/service/passport/Login.php
+++ b/app/api/service/passport/Login.php
@@ -330,7 +330,7 @@ class Login extends BaseService
             return;
         }
         // 推荐人ID
-        $refereeId = (int)$data['refereeId'] ?? null;
+        $refereeId = !empty($data['refereeId']) ?? null;
         // 用户不存在: 创建一个新用户
         $this->createUser($data['mobile'], $data['isParty'], $data['partyData'], $refereeId);
     }