Как исправить ошибку в коде на ReactPHP?

Fatal error: Uncaught Error: Call to undefined method React\EventLoop\Timer\Timer::cancel()

if (!isset($this->loop_timer)) {
            $this->loop_timer = $this->loop->addPeriodicTimer($this->timeout, function() {
                $this->run();
                if (!($this->client->run() || $this->client->has())) {
                    $this->loop_timer->cancel();
                    $this->loop_timer = null;
                }
            });
        }