Issue #3267346 by tstoeckler, e0ipso: Invalid consumer ID leads to exceptions

        $consumer_uuid = $request->query->get('_consumer_id');

      }

    }

    if (!$consumer_uuid) {

      return $this->loadDefaultConsumer();

    }

    if ($consumer_uuid) {

      try {

        /** @var \Drupal\consumers\Entity\Consumer $consumer */

        $consumer = $this->entityRepository->loadEntityByUuid('consumer', $consumer_uuid);

      }

      catch (EntityStorageException $exception) {

        watchdog_exception('consumers', $exception);

      return $this->loadDefaultConsumer();

      }

    }

    if (empty($consumer)) {

      $consumer = $this->loadDefaultConsumer();

    }

    return $consumer;

  }