Fatal error: Call to a member function on a non-object in .........

[diesel08]

i just upgraded to 3.5.1 and now im getting this error.. wasnt getting it with 3.0.7

the line bold is the one getting called for the error.

// ---------------------------------------------------
// Start Set PHP Environment
// ---------------------------------------------------

error_reporting(E_ALL & ~E_NOTICE);

// ---------------------------------------------------
// End Set PHP Environment
// ---------------------------------------------------

// ---------------------------------------------------
// Start Define Important Constants
// ---------------------------------------------------

define('NO_REGISTER_GLOBALS', 1);
define('THIS_SCRIPT', 'vbchat');

// ---------------------------------------------------
// Start Require Globalized Settings
// ---------------------------------------------------

require_once('./global.php');
require_once('./includes/functions_user.php');
require_once('./includes/functions_bbcodeparse.php');
require_once('./includes/functions_newpost.php');

$DB = $DB_site; // What? Its easier to write ^_^;
$chat_page = ""; // Template Variable

$Chat_Options = $DB->query_first("select * from ".TABLE_PREFIX."vbchat_datastore where did='1'");
$Group_Perms = unserialize($Chat_Options['d_groupperms']);