At first, great idea and plugin.
Please can you add a small check for $_SESSION to deactivate my php notices; i have all warnings anf notice on at my development client.
Many thanks
private function __construct()
{
$this->_profiler = new BlackBox_Profiler();
if ( !isset($_SESSION) )
$_SESSION = '';
$this->_globals = array(
'get' => $_GET,
'post' => $_POST,
'cookie' => $_COOKIE,
'session' => $_SESSION,
'server' => $_SERVER
);
}