<h3>Problem/motivation</h3> On Drupal 11.4.0, using any AI CKEditor tool that relies on the shared `AiCKEditorPluginBase::buildCkEditorModalForm()` method (confirmed with Tone and Summarize) throws an uncaught error and returns a 500 response from `/api/ai-ckeditor/dialog`. This happens on two independent Drupal 11.4.0 sites with no contrib modules in common (one runs Markdownify, CrowdSec, and Advban; the other runs none of these), which rules out a third-party module conflict. The root cause is this line in `AiCKEditorPluginBase.php`: $editor_id = $this->requestStack->getParentRequest()->get('editor_id'); `getParentRequest()` returns null because the AJAX dialog request is not being handled as a nested sub-request in this Drupal 11.4 code path, so calling `->get()` on it fails. This may be related to #3581842: "AI Ckeditor test broken with Drupal 11.4", which confirms a general compatibility regression between ai_ckeditor and Drupal core 11.4, though that issue documents a different symptom (a PHP warning in core's Ckeditor5Hooks.php during module installation) rather than this runtime crash. <h3>Steps to reproduce</h3> 1. Install Drupal 11.4.0 with the AI module suite, including ai_ckeditor. 2. Configure an AI provider and add the Tone (or Summarize) tool to a text format's CKEditor 5 toolbar. 3. Edit content using that text format, select some text, and open the Tone (or Summarize) tool from the CKEditor AI menu. <h3>Actual result</h3> Browser console shows: <code> toolbarview-item-unavailable /api/ai-ckeditor/dialog?_wrapper_format=drupal_modal:1 Failed to load resource: the server responded with a status of 500 Uncaught Drupal.AjaxError </code> Server logs (watchdog) show: <code> Error: Call to a member function get() on null in Drupal\ai_ckeditor\AiCKEditorPluginBase->buildCkEditorModalForm() (line 214 of .../modules/contrib/ai/modules/ai_ckeditor/src/AiCKEditorPluginBase.php). #0 .../ai_ckeditor/src/Plugin/AiCKEditor/Tone.php(149): Drupal\ai_ckeditor\AiCKEditorPluginBase->buildCkEditorModalForm() #1 .../ai_ckeditor/src/Form/AiCKEditorDialogForm.php(134): Drupal\ai_ckeditor\Plugin\AiCKEditor\Tone->buildCkEditorModalForm() #2 [internal function]: Drupal\ai_ckeditor\Form\AiCKEditorDialogForm->buildForm() ... (full core FormBuilder / EarlyRenderingControllerWrapperSubscriber / HttpKernel stack follows in both reports) </code> <h3>Environment</h3> <code> Drupal 11.4.1 A custom subtheme Bootstrap5 (Bootstrap5 v4.05) Apache/2.4.62 (Win64) OpenSSL/3.0.15 mod_fcgid/2.3.9 PHP 8.3.26 PHP Memory limit: 512M MySQL 8.4.3 PHP Caching module: OpCache </code>