diff --git a/core/lib/Drupal/Core/StackMiddleware/PageCache.php b/core/lib/Drupal/Core/StackMiddleware/PageCache.php
index d4ec291..2985334 100644
--- a/core/lib/Drupal/Core/StackMiddleware/PageCache.php
+++ b/core/lib/Drupal/Core/StackMiddleware/PageCache.php
@@ -280,6 +280,7 @@ protected function get(Request $request, $allow_invalid = FALSE) {
     if ($cache = $this->cache->get($cid, $allow_invalid)) {
       return $cache->data;
     }
+    return FALSE;
   }
 
   /**