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', '3a6136356520ee79f0fa1df1173df799', '18.232.62.134', '1711706336', '1711706336', '/index.php')

[XT SQL Error]