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', 'a2a1a1e7c43f9f6ad0704985e738e60a', '216.73.216.198', '1752878294', '1752878294', '/index.php/language/en')

[XT SQL Error]