1366 - Incorrect integer value: '' for column `magickland`.`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', 'oda1p6ej5rf2qo9g76o2vs6dh6', '3.15.240.40', '1718734926', '1718734926', '/index.php/cat/templates/xtc5/images/product_images/thumbnail_images')

[XT SQL Error]