diff --git a/index.php b/index.php
index d881959..b9bc769 100644
--- a/index.php
+++ b/index.php
@@ -49,7 +49,7 @@ $asAttendees = isset($_REQUEST['attendees'])?$_REQUEST['attendees']:'';
 $bFirstConn = isset($_GET['first_conn'])?$_GET['first_conn']:false;
 $iMessageId = isset($_GET['message_id'])?$_GET['message_id']:0;
 $oItemId = isset($_REQUEST['id'])?$_REQUEST['id']:0;
-$sSystem = isset($_POST['id'])?$_POST['system']:0;
+$sSystem = isset($_POST['system'])?$_POST['system']:'';
 $sResult = '';
 
 //Launching application