From 080aecd208c0eed4c27c28db447eddbb5e3d0e81 Mon Sep 17 00:00:00 2001
From: Thibaud Fabre <thibaud@aztech.io>
Date: Thu, 9 Jul 2015 14:40:23 +0200
Subject: [PATCH] Fix undefined property

---
 lib/classes/collection.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/classes/collection.php b/lib/classes/collection.php
index 8fff1a3d64..1f4d10834b 100644
--- a/lib/classes/collection.php
+++ b/lib/classes/collection.php
@@ -772,7 +772,7 @@ EOT;
 
     public function get_cache_key($option = null)
     {
-        return 'collection_' . $this->coll_id . ($option ? '_' . $option : '');
+        return 'collection_' . $this->get_coll_id() . ($option ? '_' . $option : '');
     }
 
     public function get_data_from_cache($option = null)