core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php b/core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php
index a8e6ba1..3c9fa5e 100644
--- a/core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php
+++ b/core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php
@@ -21,6 +21,11 @@
 
 /**
  * Subscribes to filter HTML responses, to set the 'is-active' class on links.
+ *
+ * Only for anonymous users; for authenticated users, the active-link asset
+ * library is loaded.
+ *
+ * @see system_page_attachments()
  */
 class ActiveLinkResponseFilter implements EventSubscriberInterface {
 
@@ -79,7 +84,7 @@ public function __construct(AccountInterface $current_user, CurrentPathStack $cu
    */
   public function onResponse(FilterResponseEvent $event) {
     // Only care about HTML responses.
-    if (FALSE === stripos($event->getResponse()->headers->get('Content-Type'), 'text/html')) {
+    if (stripos($event->getResponse()->headers->get('Content-Type'), 'text/html') === FALSE) {
       return;
     }