public function releaseList(\Erebot\Module\Wordlists\Wordlist $list)
    {
        $nameType = \Erebot\Module\Wordlists\Wordlist::METADATA_NAME;
        $name = $list->getMetadata($nameType);
        if (!isset(self::$refs[$name])) {
            throw new \Erebot\NotFoundException('No such list');
        }

        if (--self::$refs[$name]['counter'] <= 0) {
            unset(self::$refs[$name]);
        }
    }