From 40d9540c336d55389202073512660c74c2d8979f Mon Sep 17 00:00:00 2001
From: "Prashant.c" <Prashant.c@1936756.no-reply.drupal.org>
Date: Sun, 10 Jun 2018 11:28:29 +0500
Subject: [PATCH] Issue #2958571 by elgordogrande, Prashant.c, Fabianx:
 DrupalBlock cache error when empty

---
 src/TwigExtension.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/TwigExtension.php b/src/TwigExtension.php
index 0e6edbb..da7d328 100644
--- a/src/TwigExtension.php
+++ b/src/TwigExtension.php
@@ -137,7 +137,7 @@ class TwigExtension extends \Twig_Extension {
       // Preserve cache metadata of empty blocks.
       $build = [
         '#markup' => '',
-        '#cache' => $content['#cache'],
+        '#cache' => isset($content['#cache']) ? $content['#cache'] : [],
       ];
     }