Facebook access_token Storing in DB

Hey trying to store access tokens in my DB i got some example script here trying to make it work but no success.Hope someone can help me to make this
Here code im trying to get working
Does not insert anything to DB...

 <?php
error_reporting( E_ALL );
  ini_set('log_errors', true);
  ini_set('error_log', 'errors.txt');
# We require the library
require("src/facebook.php");
require("db.php");
require("config.php");
# Creating the facebook object
$facebook = new Facebook(array(
'appId' => $app_id,
'secret' => $app_secret,
'cookie' => true
));
# Let's see if we have an active session
$session = $facebook->getUser();
if(!empty($session))
{
try
{
$fbid = $session['uid'];
$access_token=$session['access_token'];
// Updating Facebook values into Users table
mysql_query("UPDATE users SET fbid='".$fbid."', access_token='".$access_token."' ");
echo mysql_error();
header("Location: http://domain.com/test/home.php");
}
catch (Exception $e){}
}
else
{
header("Location: http://domain.com/test/home.php");
}
?>

Code (markup):