DB error 1064

[dwilson]

Can some some clarify this error plz?

[SELECT count(open.ticket_id) as open, count(answered.ticket_id) as answered ,count(overdue.ticket_id) as overdue, count(assigned.ticket_id) as assigned FROM ost_ticket ticket LEFT JOIN ost_ticket open ON open.ticket_id=ticket.ticket_id AND open.status='open' AND open.isanswered=0 LEFT JOIN ost_ticket answered ON answered.ticket_id=ticket.ticket_id AND answered.status='open' AND answered.isanswered=1 LEFT JOIN ost_ticket overdue ON overdue.ticket_id=ticket.ticket_id AND overdue.status='open' AND overdue.isoverdue=1 LEFT JOIN ost_ticket assigned ON assigned.ticket_id=ticket.ticket_id AND assigned.staff_id=8 WHERE (ticket.dept_id IN () )]

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 ') )' at line 1