Issue #3388364 by dieterholvoet, alexpott, linwilvic, chr.fritsch: AJAX error...

Issue #3388364 by dieterholvoet, alexpott, linwilvic, chr.fritsch: AJAX error within WYSIWYG editor media button

media_library_media_modify.module

@@ -64,13 +64,14 @@ function media_library_media_modify_form_media_library_add_form_alter(array &$fo
   /** @var \Drupal\media_library\MediaLibraryState $media_library_state */
   $media_library_state = $form_state->get('media_library_state');
   $added_media = $form_state->get('media') ?: [];
-  if ((is_countable($added_media) ? count($added_media) : 0) > 1 && $media_library_state->getOpenerParameters()['multi_edit_on_create']) {
+  $parameters = $media_library_state->getOpenerParameters();
+  if ((is_countable($added_media) ? count($added_media) : 0) > 1 && $parameters['multi_edit_on_create'] ?? FALSE) {
     /** @var \Drupal\media_library_media_modify\MultipleUploadFormHandler $multiple_form_handler */
     $multiple_form_handler = \Drupal::classResolver()->getInstanceFromDefinition(MultipleUploadFormHandler::class);
     $multiple_form_handler->buildForm($form, $form_state);
     return;
   }
-  if ($media_library_state->getOpenerParameters()['no_edit_on_create']) {
+  if ($parameters['no_edit_on_create'] ?? FALSE) {
     if ($form_id === 'media_library_add_form_upload') {
       $form['container']['upload']['#process'][] = '_media_library_media_modify_file_widget_overwrite_process';
     }