diff -u b/core/modules/overlay/lib/Drupal/overlay/EventSubscriber/OverlaySubscriber.php b/core/modules/overlay/lib/Drupal/overlay/EventSubscriber/OverlaySubscriber.php
--- b/core/modules/overlay/lib/Drupal/overlay/EventSubscriber/OverlaySubscriber.php
+++ b/core/modules/overlay/lib/Drupal/overlay/EventSubscriber/OverlaySubscriber.php
@@ -80,7 +80,7 @@
     // set. Other modules can also enable the overlay directly for other uses.
     $user_data = $this->userData->get('overlay', $user->id(), 'enabled');
     $use_overlay = !isset($user_data) || $user_data;
-    if (empty($mode) && $request->attributes->get('_account')->hasPermission('access overlay') && $use_overlay) {
+    if (empty($mode) && $user->hasPermission('access overlay') && $use_overlay) {
       $current_path = $request->attributes->get('_system_path');
       // After overlay is enabled on the modules page, redirect to
       // <front>#overlay=admin/modules to actually enable the overlay.
diff -u b/core/modules/overlay/overlay.module b/core/modules/overlay/overlay.module
--- b/core/modules/overlay/overlay.module
+++ b/core/modules/overlay/overlay.module
@@ -229,7 +229,7 @@
  * @see http://drupal.org/node/890284
  */
 function overlay_disable_message() {
-  $user = Drupal::request()->attributes->get('_account');
+  global $user;
 
   $build = array();
   if ($user->isAnonymous() || !$user->hasPermission('access overlay')) {