diff --git a/core/modules/system/src/Controller/SystemController.php b/core/modules/system/src/Controller/SystemController.php
index cce4706..9ed4227 100644
--- a/core/modules/system/src/Controller/SystemController.php
+++ b/core/modules/system/src/Controller/SystemController.php
@@ -398,33 +398,33 @@ public static function setLinkActiveClass(array $element, array $context) {
       $node = $dom->getElementsByTagName('body')->item(0)->firstChild;
 
       // Ensure we don't set the "active" class twice on the same element.
-      $is_active = !in_array('active', explode(' ', $node->getAttribute('class')));
+      $class = $node->getAttribute('class');
+      $add_active = !in_array('active', explode(' ', $class));
 
       // The language of an active link is equal to the current language.
-      if ($is_active && $context['language']) {
+      if ($add_active && $context['language']) {
         if ($node->hasAttribute('hreflang') && $node->getAttribute('hreflang') !== $context['language']) {
-          $is_active = FALSE;
+          $add_active = FALSE;
         }
       }
       // The query parameters of an active link are equal to the current
       // parameters.
-      if ($is_active) {
+      if ($add_active) {
         if ($context['query']) {
           if (!$node->hasAttribute('data-drupal-link-query') || $node->getAttribute('data-drupal-link-query') !== Json::encode($context['query'])) {
-            $is_active = FALSE;
+            $add_active = FALSE;
           }
         }
         else {
           if ($node->hasAttribute('data-drupal-link-query')) {
-            $is_active = FALSE;
+            $add_active = FALSE;
           }
         }
       }
 
       // Only if the the path, the language and the query match, we set the
       // "active" class.
-      if ($is_active) {
-        $class = $node->getAttribute('class');
+      if ($add_active) {
         if (strlen($class) > 0) {
           $class .= ' ';
         }