From 77094253584bde34058fecfa0d838be7b7c9fadb Mon Sep 17 00:00:00 2001
From: Alexander O'Neill <aloneill@gmail.com>
Date: Wed, 2 Feb 2022 17:03:22 +0000
Subject: [PATCH] Add check for cache tags in JSON-LD alter hook.

---
 islandora.module | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/islandora.module b/islandora.module
index 738be5b4..85abaf0d 100644
--- a/islandora.module
+++ b/islandora.module
@@ -251,7 +251,7 @@ function islandora_jsonld_alter_normalized_array(EntityInterface $entity, array
     $reaction->execute($entity, $normalized, $context);
     foreach ($context_manager->getActiveContexts() as $context_config) {
       try {
-        if ($context_config->getReaction($reaction->getPluginId())) {
+        if ($context_config->getReaction($reaction->getPluginId()) && isset($context['cacheability'])) {
           $context['cacheability']->addCacheTags($context_config->getCacheTags());
         };
       }