diff --git a/core/modules/locale/locale.datepicker.js b/core/modules/locale/locale.datepicker.js
index 197fc42..9249c32 100644
--- a/core/modules/locale/locale.datepicker.js
+++ b/core/modules/locale/locale.datepicker.js
@@ -14,6 +14,9 @@
    */
   Drupal.behaviors.localeDatepicker = {
     attach: function (context, settings) {
+      if (!drupalSettings.jquery || !drupalSettings.jquery.ui || !drupalSettings.jquery.ui.datepicker) {
+        return;
+      }
       // This code accesses drupalSettings and localized strings via Drupal.t().
       // So this code should run after these are initialized. By placing it in an
       // attach behavior this is assured.