diff --git a/B3WeChat.Web/Pages/WeChatLogin.cs b/B3WeChat.Web/Pages/WeChatLogin.cs
index d9975b4..9ab5b0d 100644
--- a/B3WeChat.Web/Pages/WeChatLogin.cs
+++ b/B3WeChat.Web/Pages/WeChatLogin.cs
@@ -20,6 +20,13 @@ namespace BWP.Web.Pages
     public void ProcessRequest(HttpContext context)
     {
       var code = context.Request.QueryString["code"];
+      if (string.IsNullOrEmpty(code))
+      {
+        context.Response.Write("require login code");
+        context.Response.End();
+        return;
+      }
+
       var url = context.Request.QueryString["url"];
       Global.WeChatLoginAndRedirect(code, url);
     }