Index: backup/moodle2/restore_stepslib.php
===================================================================
RCS file: /cvsroot/moodle/moodle/backup/moodle2/restore_stepslib.php,v
retrieving revision 1.73.2.2
diff -u -r1.73.2.2 restore_stepslib.php
--- backup/moodle2/restore_stepslib.php 2 Feb 2012 11:49:52 -0000       1.73.2.2
+++ backup/moodle2/restore_stepslib.php 7 Feb 2012 09:21:39 -0000
@@ -1116,7 +1116,10 @@
         $data->id = $this->get_courseid();
         $data->fullname = $fullname;
         $data->shortname= $shortname;
-
+        //To prevent postgresql error:  inseting null violates not null constraints
+        if ($data->hiddensections == null) {
+          unset($data->hiddensections);
+        }
         $context = get_context_instance_by_id($this->task->get_contextid());
         if (has_capability('moodle/course:changeidnumber', $context, $this->task->get_userid())) {
             $data->idnumber = '';