From 7323411bb67ec7f25205b473632b42b95086ec79 Mon Sep 17 00:00:00 2001
From: Mark Jordan <mjordan@sfu.ca>
Date: Thu, 22 Jan 2015 09:18:20 -0800
Subject: [PATCH] Address ISLANDORA-1162

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

diff --git a/islandora.module b/islandora.module
index 270edf4e..fba7206a 100644
--- a/islandora.module
+++ b/islandora.module
@@ -1976,7 +1976,7 @@ function islandora_islandora_datastream_access($op, AbstractDatastream $datastre
     $hooks = islandora_invoke_hook_list(ISLANDORA_DERVIATIVE_CREATION_HOOK, $object->models, array($object));
     $hooks = islandora_filter_derivatives($hooks, array('force' => TRUE), $object);
     foreach ($hooks as $hook) {
-      if ($hook['destination_dsid'] == $datastream->id &&
+      if (isset($hook['destination_dsid']) && $hook['destination_dsid'] == $datastream->id &&
         (is_null($hook['source_dsid']) || islandora_datastream_access(ISLANDORA_VIEW_OBJECTS, $object[$hook['source_dsid']], $user))) {
         $applicable_hook = TRUE;
         break;