winner selection

WordPress database error: [Column 'customer_id' in field list is ambiguous]
SELECT order_id, customer_id, ticket_number FROM wpgld_rtg_tickets_customer_to_tickets t1, wpgld_wc_orders t2 where t2.id = t1.order_id and t2.status != "wc-refunded" and t2.status != "wc-cancelled" and t2.status != "trash" and t1.category_id=59 order by RAND()