diff --git a/core/lib/Drupal/Core/Template/TwigEnvironment.php b/core/lib/Drupal/Core/Template/TwigEnvironment.php
index ad5d0f0..a65fef3 100644
--- a/core/lib/Drupal/Core/Template/TwigEnvironment.php
+++ b/core/lib/Drupal/Core/Template/TwigEnvironment.php
@@ -120,7 +120,7 @@ public function getCacheFilename($name) {
     // and their mtime.
     // @see \Drupal\Core\DependencyInjection\Compiler\TwigExtensionPass

-    if (!$this->cache) {
+    if (!$this->getCache()) {
       return FALSE;
     }

diff --git a/core/vendor/twig/twig/lib/Twig/Environment.php b/core/vendor/twig/twig/lib/Twig/Environment.php
index 79726ec..94364a2 100644
--- a/core/vendor/twig/twig/lib/Twig/Environment.php
+++ b/core/vendor/twig/twig/lib/Twig/Environment.php
@@ -34,7 +34,7 @@ class Twig_Environment
     private $tests;
     private $functions;
     private $globals;
-    private $runtimeInitialized = false;
+    protected $runtimeInitialized = false;
     private $extensionInitialized = false;
     private $loadedTemplates;
     private $strictVariables;