Can't add user/admin

Imported From: http://groups.google.com/group/in-portal-bugs/browse_thread/thread/bb107d2924e61040#

In the current 5.2.x version Avatar field is defined  in the
users_config.php as Fields, but there is no Avatar fieldd in the Users
table. So on user save SQL error happens - Unknown column 'Avatar' in
'field list'