>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3505215. --> Reported by: [torfj](https://www.drupal.org/user/3762700) Related to !460 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>I am getting this error in the log messages:</p> <p>Deprecated function: str_replace(): Passing null to parameter #2 ($replace) of type array|string is deprecated in Drupal\ai_assistant_api\Service\AssistantMessageBuilder-&gt;buildMessage() (line 110 of /var/www/html/web/modules/contrib/ai/modules/ai_assistant_api/src/Service/AssistantMessageBuilder.php)</p> <p>Solution:<br> This is a PHP 8.1+ deprecation warning to ensure the placeholders are safely replaced.<br> To fix this you can convert NULL to an empty string before calling str_replace().</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>I am using Core 11.1.2 and AI module version 1.0.4.</p>