Index: moodle/mod/lamslesson/lib.php
===================================================================
RCS file: /usr/local/cvsroot/moodle/mod/lamslesson/lib.php,v
diff -u -r1.8 -r1.9
--- moodle/mod/lamslesson/lib.php	4 Dec 2011 18:36:44 -0000	1.8
+++ moodle/mod/lamslesson/lib.php	6 Jan 2012 13:23:00 -0000	1.9
@@ -711,7 +711,7 @@
 		$listofcontexts = '('.$sitecontext->id.')'; // must be site
 	}
 	$sql = "SELECT u.id
-		FROM {$CFG->prefix}user u INNER JOIN {$CFG->prefix}role_assignments r ON u.id=r.userid
+		FROM {user} u INNER JOIN {role_assignments} r ON u.id=r.userid
 		WHERE r.contextid IN $listofcontexts OR r.contextid=$context->id
 		AND u.deleted=0 AND u.username!='guest'";
 	$users = $DB->get_records_sql($sql);