Running scrapy spider from inside a loop

Question

I Have a program which gets an input from RabbitMQ's queue and then run a scrapy spider passing this input. It works fine, but just for the first time, after the first input it throws this error:

twisted.internet.error.ReactorNotRestartable

Here is my code:

 def start_flow(crawler_class):
        # Create the queue and all the connections
        queue = Queue(connection_uri='amqp://guest:guest@localhost:5672/')
        queue.create_connection()
        queue.create_channel()
        queue_name = _get_queue_name(crawler_class)
        queue.define_queue(queue_name)
        # ---------------------------------------

        while True:
            print("Waiting for the next input")
            # Get an input
            queue.consume(queue_name)
            queue.channel.start_consuming()
            input_ = queue.get_next_input() 
            # ------------

            # Runs the crawler passing the input
            runner = CrawlerRunner()
            d = runner.crawl(crawler_class, input=input_)
            d.addCallback(lambda _: reactor.stop())
            reactor.run()
            # ----------------------------

I already tried CrawlerProcess, but it throws the same problem