if ($res['type_discount'] == 'group_user' && !$dm->validateGroupDiscount($res['type_value']) && $res['active'] == 0) {
            $msg = showMessage(lang('This group of users already have active discount', 'mod_discount'), lang('Error'), 'error', TRUE);
            echo json_encode(['status' => 0, 'msg' => $msg]);
            return;
        }