php - Symfony Amqp Messenger“调用成员函数 get() null”

Question

我的控制器

$arr = array(
        "key1",
        "key2",
        "key3"
    );
    foreach ($arr as $key) {
        $this->bus->dispatch(new HubspotMessage($key));

    }

我的消息处理程序

$key = $hubspotMessage->getKey();

$selectedEntity = $this->entityManager->getRepository(Deal::class)->find(30);

我已经尝试了几件事，但总是得到这样的错误。

Error thrown while handling message App\Message\HubspotMessage. Sending for retry #2 using 2000 ms delay. Error: "Call to a member function get() on null"