diff --git a/partner-trugee.js b/partner-trugee.js
index d50d364..644c052 100644
--- a/partner-trugee.js
+++ b/partner-trugee.js
@@ -199,10 +199,10 @@ function createServer() {
             response_code = '00';
             sn = qs.sn;
             if (sn && typeof sn === 'string') {
-                sn = sn.toUpperCase().replace(/[^A-Z0-9\/]/g, '-').replace(/-+/g, '-').replace(/-+\//g, '/').replace(/^-+/, '').replace(/-+$/, '-');
+                sn = sn.toUpperCase().replace(/[^A-Z0-9\/]/g, '-').replace(/-+/g, '-').replace(/-+\//g, '/').replace(/^-+/, '').replace(/-+$/, '');
             }
 
-            message = 'SN=' + qs.sn + '; ' + message;
+            message = 'SN=' + sn + '; ' + message;
         }
 
         if (response_code == '40') {