From 1a36d4fec45242dd3443dd2ced489a593c0cac88 Mon Sep 17 00:00:00 2001
From: Bharat Mediratta <bharat@menalto.com>
Date: Tue, 12 May 2009 22:48:59 +0000
Subject: parent() should return null if there's no parent id

---
 core/libraries/ORM_MPTT.php | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'core')

diff --git a/core/libraries/ORM_MPTT.php b/core/libraries/ORM_MPTT.php
index 265cb8fb..f64ec200 100644
--- a/core/libraries/ORM_MPTT.php
+++ b/core/libraries/ORM_MPTT.php
@@ -117,6 +117,9 @@ class ORM_MPTT_Core extends ORM {
    * @return ORM
    */
   function parent() {
+    if (!$this->parent_id) {
+      return null;
+    }
     return model_cache::get($this->model_name, $this->parent_id);
   }
 
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