Fix "Call to a member function close() on null" exception

Author: paramtamtam

src/LaravelQueueRabbitMQServiceProvider.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Queue\QueueManager;
 use Illuminate\Support\ServiceProvider;
+use PhpAmqpLib\Connection\AMQPStreamConnection;
 use VladimirYuldashev\LaravelQueueRabbitMQ\Queue\Connectors\RabbitMQConnector;
 use VladimirYuldashev\LaravelQueueRabbitMQ\Queue\Connectors\RabbitMQConnectorSSL;
 
@@ -38,11 +39,14 @@ public function boot()
         }
 
         $queue->stopping(function () use ($connector) {
-            $connector->connection()->close();
+            if ($connector->connection() instanceof AMQPStreamConnection) {
+                $connector->connection()->close();
+            }
         });
 
         $queue->addConnector('rabbitmq', function () use ($connector) {
             return $connector;
         });
     }
 }
+