diff --git a/app/Service/Api/Login/WxFastLoginService.php b/app/Service/Api/Login/WxFastLoginService.php
index d6800b5..26d8ae9 100644
--- a/app/Service/Api/Login/WxFastLoginService.php
+++ b/app/Service/Api/Login/WxFastLoginService.php
@@ -41,7 +41,7 @@ class WxFastLoginService extends LoginBaseService
 
         $wxInfo = $this->jsCodeGetOpenId($this->jsCode);
         $this->openId = $wxInfo['openid'];
-        $this->unionId = $wxInfo['unionid'];
+        $this->unionId = $wxInfo['unionid'] ?? '';
 
         $this->checkLock(self::LOGIN_TYPE);