FIxed a notice

diff --git a/lib/grade/grade_tree.php b/lib/grade/grade_tree.php
index d737371d524d8dd02772713fd433825d9c871e55..f0c3b332ca92a2d4cd68c7649c73aa28269b2f6a 100644 (file)
--- a/lib/grade/grade_tree.php
+++ b/lib/grade/grade_tree.php
@@ -76,7 +76,7 @@ class grade_tree {
         $this->levels = array();
 
         // get course grade tree
-        $this->top_element =& grade_category::fetch_course_tree($courseid, $include_grades, true);
+        $this->top_element = grade_category::fetch_course_tree($courseid, $include_grades, true);
 
         if ($category_grade_last) {
             grade_tree::category_grade_last($this->top_element);