User ID handling upon logout

Hi guys,

I am trying to update a meta column each time a user logs out of the site, currently I have the following within my plugin:

add_action('template_redirect', function() {
            global $current_user;
            get_currentuserinfo();

            $this->bbpis_userID = $current_user->ID;
        }, 10 );        

        add_action('template_redirect', array( $this, 'bbpis_whosonline_update' ), 10 );
        add_action('clear_auth_cookie', array( $this, 'bbpis_useroffline' ), 10 );

There is a problem however, the user id gets destroyed when the user goes through the logout process.

Does anyone know of a way I can use to resolve this?