1366 - Incorrect integer value: '' for column `mapshopatlogis`.`whos_online`.`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', '4a845897bcfae9d2ccd89c2e22fd931c', '18.97.9.168', '1752495791', '1752495791', '/index.php?refID=1')

[XT SQL Error]