diff --git a/index.js b/index.js
index ded6eee..f0cbc0c 100644
--- a/index.js
+++ b/index.js
@@ -16,6 +16,7 @@ redisSubscriber.on('message', function(channel, message) {
         var params = JSON.parse(message);
         
         if (params['resp_code'] != '00') return;
+        if (params['ussd_msg'].indexOf('$SN=;OK') >= 0) return;
         
         redisClient.hset('stock.dompul.by-denom.' + params['ussd_nom'], params['ussd_chipinfo'], parseInt(params['ussd_stok']));
         redisClient.hset('stock.dompul.by-chipinfo.' + params['ussd_chipinfo'], params['ussd_nom'], parseInt(params['ussd_stok']));