diff -u b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/I18nMenuLink.php b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/I18nMenuLink.php
--- b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/I18nMenuLink.php
+++ b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/I18nMenuLink.php
@@ -42,7 +42,9 @@
    */
   protected function values() {
     $values = [];
-    $result = $this->prepareQuery()->execute()->fetchAll();
+    $result = $this->prepareQuery();
+    $result->execute();
+    $result->fetchAll();
     $cnt = count($result);
     for ($i = 0; $i < $cnt; $i++) {
       if (isset($result[$i])) {
@@ -94,14 +96,14 @@
    * {@inheritdoc}
    */
   public function fields() {
-    return array(
+    return [
       'mlid' => t('The menu link ID.'),
       'language' => $this->t('Language for this menu.'),
       'title' => $this->t('Menu link title.'),
       'description' => $this->t('Menu link description.'),
       'link_path' => t('The Drupal path or external path this link points to.'),
       'options' => t('A serialized array of options to set on the URL, such as a query string or HTML attributes.'),
-    );
+    ];
   }
 
   /**