Jtl\Connector\Core\Http\JsonResponse::prepareAndSend() must be an instance of Jtl\Connector\Core\Rpc\ResponsePacket, null given,
// src/Controller/Product.php
namespace Acme\Connector\AcmeShop\Controller;
use Jtl\Connector\Core\Controller;
use Jtl\Connector\Core\Model\AbstractDataModel;
class Product implements PushInterface
{
public function push(AbstractDataModel $model) : AbstractDataModel;
{
return $model;
}
}