1366 - Incorrect integer value: '' for column `pella-ware`.`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', '7e1cec3793331a34ac421528ccdac98b', '3.145.131.28', '1713536322', '1713536322', '/shopping_cart.php?language=en')

[XT SQL Error]