protected function pingTimedout()
    {
        $timedout = false;

        $this->database = $this->database->filter(function ($item) use (
            &$timedout
        ) {
            if (! $item['ponged_at']) {
                if (
                    Carbon::now()->diffInSeconds(
                        $this->parseDate($item['pinged_at'])
                    ) > $this->target->timeout
                ) {
                    $timedout = true;

                    return false;
                }

                return true;
            }

            return false;
        });

        return $timedout;
    }