Error message Notice: Trying to access array offset on value of type null in Drupal\coveo\Plugin\search_api\backend\SearchApiCoveoBackend->search() (line 404)

Seeing the error on multiple pages, not properly checking for keywords.

Error message
Notice: Trying to access array offset on value of type null in Drupal\coveo\Plugin\search_api\backend\SearchApiCoveoBackend->search() (line 404 of coveo/src/Plugin/search_api/backend/SearchApiCoveoBackend.php).