diff --git a/src/main/java/au/com/royalpay/payment/manage/signin/web/SignInController.java b/src/main/java/au/com/royalpay/payment/manage/signin/web/SignInController.java
index 09d3c9f2a..59c92772c 100644
--- a/src/main/java/au/com/royalpay/payment/manage/signin/web/SignInController.java
+++ b/src/main/java/au/com/royalpay/payment/manage/signin/web/SignInController.java
@@ -322,6 +322,7 @@ public class SignInController {
         if (ua.toLowerCase().contains("royalpayclient")) {
             response.sendRedirect("/api/v1.0/retail/app/partner_signin_app_qrcode/" + codeId);
         }
+        System.err.println("The Wrong Browser's UA is :" + ua);
         throw new ForbiddenException("error.not_support_browser");
     }
 }