diff -u b/core/lib/Drupal/Component/PhpStorage/FileStorage.php b/core/lib/Drupal/Component/PhpStorage/FileStorage.php
--- b/core/lib/Drupal/Component/PhpStorage/FileStorage.php
+++ b/core/lib/Drupal/Component/PhpStorage/FileStorage.php
@@ -37,16 +37,16 @@
    * Implements Drupal\Component\PhpStorage\PhpStorageInterface::exists().
    */
   public function exists($name) {
-    $path = $this->getFullPath($name);
-    return file_exists($path);
+    return file_exists($this->getFullPath($name));
   }
 
   /**
    * Implements Drupal\Component\PhpStorage\PhpStorageInterface::load().
    */
   public function load($name) {
-    $path = $this->getFullPath($name);
-    @include_once($path);
+    // The FALSE returned on failure is enough for the caller to handle this,
+    // we do not want a warning too.
+    return @include_once($this->getFullPath($name)) !== FALSE;
   }
 
   /**