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', 'du2p5kuuei20mf2b4v1vo16m06', '3.144.36.122', '1746980925', '1746980925', '/xtshop/product_info.php?info=p919_.html')

[XT SQL Error]