SQL error when updateing "Manage fileds"

When I update the "Manage Fields" page, after I set up eg. a group, I get the following error:
user warning: Duplicate entry 'arlista-group-rak-' for key 1 query: INSERT INTO node_group_fields (type_name, group_name, field_name) VALUES ('arlista', 'group-rak', '') in /var/www/pal/rudan/rudan.hu/portal/includes/database.mysql.inc on line 172.

I updated form 5.x-1.0, but the update has said, there was no errors.