diff --git a/src/Symfony/Component/HttpKernel/HttpCache/Store.php b/src/Symfony/Component/HttpKernel/HttpCache/Store.php
index 9533cf637c..c831ba2ac3 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/Store.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/Store.php
@@ -356,7 +356,7 @@ class Store implements StoreInterface
     {
         $path = $this->getPath($key);
 
-        return file_exists($path) ? file_get_contents($path) : null;
+        return file_exists($path) && false !== ($contents = file_get_contents($path)) ? $contents : null;
     }
 
     /**