1366 - Incorrect integer value: '' for column `meersalz_2017`.`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', 'd00ov2s1c6hjkidjben29niv66', '184.72.102.217', '1610966610', '1610966610', '/product_info.php?products_id=1001')

[XT SQL Error]