public function getAdminUser($force = false) {

        if ($this->nb_admin_user === null || $force) {
            $this->nb_admin_user = null;
            if ($this->isValueNumeric('nb_server_admin_user_id')) {
                $nb_user = new CNabuUser($this->getAdminUserId());
                if ($nb_user->isFetched()) {
                    $this->nb_admin_user = $nb_user;
                }
            }
        }

        return $this->nb_admin_user;
    }