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', '9c9d9097b1ea7c34e0ab976d17647a11', '18.117.186.92', '1713984356', '1713984356', '/index.php')

[XT SQL Error]