Fatal error: Uncaught Error: Call to a member function getResults() on null in /var/www/html/vendor/doofinder/doofinder-magento2/Helper/Search.php:99 Stack trace: #0 /var/www/html/vendor/doofinder/doofinder-magento2/Search/Adapter.php(111): Doofinder\Feed\Helper\Search->performDoofinderSearch('', Array) #1 /var/www/html/vendor/doofinder/doofinder-magento2/Search/Adapter.php(83): Doofinder\Feed\Search\Adapter->getDocuments('', Array) #2 /var/www/html/vendor/magento/module-search/Model/SearchEngine.php(42): Doofinder\Feed\Search\Adapter->query(Object(Magento\Framework\Search\Request)) #3 /var/www/html/vendor/magento/framework/Search/Search.php(85): Magento\Search\Model\SearchEngine->search(Object(Magento\Framework\Search\Request)) #4 /var/www/html/vendor/magento/module-catalog-search/Model/ResourceModel/Fulltext/Collection.php(503): Magento\Framework\Search\Search->search(Object(Magento\Framework\Api\Search\SearchCriteria)) #5 /var/www/html/vendor/magento/framework/Data/Collection/AbstractDb.php(343): Magento\CatalogSearch\ in /var/www/html/vendor/doofinder/doofinder-magento2/Helper/Search.php on line 99