>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3557904. --> Reported by: [gxleano](https://www.drupal.org/user/3591999) Related to !9 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>The Vector DB Explorer (<code>vector_db_generator </code>plugin) in the AI Search module throws a <code>Twig\Error\RuntimeError</code> when search results contain array values in their extra data.<br> The error occurs because the code assumes all extra data values are strings, but search results can contain complex data structures such as arrays.</p> <p>Error message: </p> <p><code>Twig\Error\RuntimeError: An exception has been thrown during the rendering of a template ("strlen(): Argument #1 ($string) must be of type string, array given") in "__string_template__36eeab8377919817875a18c90610bda7" at line 1.</code></p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>1. Install and enable the AI Search module<br> 2. Configure a Search API index with the <code>search_api_ai_search</code> backend<br> 3. Index content that includes complex metadata or field values<br> 4. Navigate to <code>/admin/config/ai/explorers/vector_db_generator</code><br> 5. Enter a search query and submit the form<br> 6. See the Twig runtime error when the results contain array values in extra data</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Add type checking in the <code>getResponse()</code> method to handle non-string values:</p> <ul> <li>Convert array values to JSON strings for display</li> <li>Cast other non-string types to strings</li> <li>Ensure all values are strings before passing to the Markdown converter or renderer</li> </ul>