From 3e0e2436deba09b9b2cd269a4a16cfc9456533a5 Mon Sep 17 00:00:00 2001
From: skodak <skodak>
Date: Thu, 4 Oct 2007 08:36:34 +0000
Subject: [PATCH] MDL-11582 switch category item only if it is really there

---
 grade/lib.php | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/grade/lib.php b/grade/lib.php
index 8c09071634..9a5ad49dc8 100644
--- a/grade/lib.php
+++ b/grade/lib.php
@@ -941,10 +941,13 @@ class grade_tree {
         if (count($element['children']) < 2) {
             return;
         }
-        $category_item = reset($element['children']);
-        $order = key($element['children']);
-        unset($element['children'][$order]);
-        $element['children'][$order] =& $category_item;
+        $first_item = reset($element['children']);
+        if ($first_item['type'] == 'categoryitem') {
+            // the category item might have been already removed
+            $order = key($element['children']);
+            unset($element['children'][$order]);
+            $element['children'][$order] =& $first_item;
+        }
         foreach ($element['children'] as $sortorder => $child) {
             grade_tree::category_grade_last($element['children'][$sortorder]);
         }
-- 
2.39.5