prevent whitescreen when rendering media attribution

media_attribution.module

@@ -149,10 +149,11 @@ function media_attribution_preprocess_entity_embed_container(&$variables) {
       '#prefix' => ' ',
     ];
   }
+  $children = ['#markup' => $variables['children']];
   $variables['children'] = [
     'first' => [
       '#type' => 'markup',
-      '#markup' => \Drupal::service('renderer')->render($variables['children'])
+      '#markup' => \Drupal::service('renderer')->render($children)
     ],
     $attribution_text
   ];