From be074bc3e6ea7901b8261fdfeddb90d1dd576cc3 Mon Sep 17 00:00:00 2001
From: tjhunt <tjhunt>
Date: Mon, 12 May 2008 10:44:42 +0000
Subject: [PATCH] MDL-14797 - Error when moving a course to an empty category
 on Postgres

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

diff --git a/course/lib.php b/course/lib.php
index 1b9835c9b24..b7321546be1 100644
--- a/course/lib.php
+++ b/course/lib.php
@@ -1847,7 +1847,7 @@ function move_courses ($courseids, $categoryid) {
                     // figure out a sortorder that we can use in the destination category
                     $sortorder = get_field_sql('SELECT MIN(sortorder)-1 AS min
                                                     FROM ' . $CFG->prefix . 'course WHERE category=' . $categoryid);
-                    if ($sortorder === false) {
+                    if (is_null($sortorder) || $sortorder === false) {
                         // the category is empty
                         // rather than let the db default to 0
                         // set it to > 100 and avoid extra work in fix_coursesortorder()