Search API - Can't get result items

I installed Search API, created Search Index, and it's using the Solr server. When I execute the query and debug the code afterward, I get 3 result counts. And for result items, I get an empty array. When I try the same query in Solr Admin, I get 3 result counts as well as result items.

public function searchResults() {
    $parse_mode = \Drupal::service('plugin.manager.search_api.parse_mode')
      ->createInstance('terms');
    $parse_mode->setConjunction('OR');

    /** @var Query $query */
    $query = Index::load('default_solr_index')->query();
    $query->addCondition('status', 'true');
    $query->setOption('bq', 'base_site_url:"' . 'http://test.local' . '"^4');
    $query->keys('editor');
    $query->setLanguages(['en']);
    $query->setFulltextFields(['field_summary']);
    $query->range(50, 10);
    $query->setParseMode($parse_mode);
    $query->addTag('custom_search');

    $data = $query->execute();

    $results = $data->getResultItems(); // I get empty array
    $resultCount = $data->getResultCount(); // I get int 3
  }

I tried to change this line of code:

    $query->range(50, 10);

to:

    $query->range(0, 10);

But I get this error:

Argument 4 passed to Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::getHighlighting() must be of the type array, null given, called in /var/www/html/my-project/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 2748

What am I doing wrong? This is my code and I use the Drupal 8 version.