1366 - Incorrect integer value: '' for column 'customer_id' at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', 'ton57aooc03gpntcnhh62r9kd2', '18.119.248.249', '1746979905', '1746979905', '/xtshop/product_info.php?info=p1099_.html')

[XT SQL Error]