Fehler im Admin backend

[Gilles]

hi, ich bekomme beim klicken auf Bestrellungen folgende Fehlermeldung :

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-20, 20' at line 1

select o.orders_id, o.customers_name, o.payment_method, o.date_purchased, o.last_modified, o.currency, o.currency_value, s.orders_status_name, ot.text as order_total from orders o left join orders_total ot on (o.orders_id = ot.orders_id), orders_status s where o.orders_status = s.orders_status_id and s.language_id = '2' and ot.class = 'ot_total' order by o.orders_id DESC limit -20, 20

[XT SQL Error]

Woran liegt das ?
bzw. wie beseitige ich den fehler ?