Issue #3317126: Undefined array key "#paragraph_type"

require_on_publish.module

@@ -194,17 +194,18 @@ function require_on_publish_field_widget_single_element_paragraphs_form_alter(ar
  * Helper function that adds an indicator to paragraph elements.
  */
 function _require_on_publish_add_indicator_to_paragraph(&$element, FormStateInterface $form_state, $context) {
-  $paragraph_type = $element['#paragraph_type'];
-  $fields = \Drupal::service('entity_field.manager')->getFieldDefinitions('paragraph', $paragraph_type);
-  foreach ($fields as $field_config) {
-    if (!($field_config instanceof FieldConfigInterface)) {
-      continue;
-    }
-    if ($field_config->getThirdPartySetting('require_on_publish', 'require_on_publish', FALSE)) {
-      $field_name = $field_config->getName();
-      $element['#attached']['library'][] = 'require_on_publish/require_on_publish';
-      if (isset($element['subform'][$field_name]['widget'])) {
-        require_on_publish_add_indicator($element['subform'][$field_name]['widget']);
+  if ($paragraph_type = $element['#paragraph_type']) {
+    $fields = \Drupal::service('entity_field.manager')->getFieldDefinitions('paragraph', $paragraph_type);
+    foreach ($fields as $field_config) {
+      if (!($field_config instanceof FieldConfigInterface)) {
+        continue;
+      }
+      if ($field_config->getThirdPartySetting('require_on_publish', 'require_on_publish', FALSE)) {
+        $field_name = $field_config->getName();
+        $element['#attached']['library'][] = 'require_on_publish/require_on_publish';
+        if (isset($element['subform'][$field_name]['widget'])) {
+          require_on_publish_add_indicator($element['subform'][$field_name]['widget']);
+        }
       }
     }
   }