--- admin/user/actions/enroltocourses/index.php	2009-02-20 11:05:56.000000000 +0300
+++ admin/user/actions/enroltocourses/index.php	2009-02-20 11:28:09.000000000 +0300
@@ -118,7 +118,8 @@
         $in = implode(',', $SESSION->bulk_users);
         $groupid = false;
         if ($roleassign == 0) {
-            $roleassign = get_default_course_role( $context )->id;
+            $defrole = get_default_course_role( $context );
+            $roleassign = $defrole->id;
         }
         if (!empty($groupname)) {
             $groupid = groups_get_group_by_name($course, stripslashes($groupname));