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', '01b0767g276ae2ca9uj4lh96c2', '3.236.98.25', '1593691344', '1593691344', '/shop_content.php?coID=4')

[XT SQL Error]