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', '5f818873587776cfa4f1ccb398efa8c7', '3.17.154.171', '1713873072', '1713873072', '/product_info.php/info/p2_Fruehtrachthonig.html')

[XT SQL Error]