1366 - Incorrect integer value: '' for column `argus_xtc`.`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', '4pg0a10bp03o4t518k0o6d8t33', '18.215.161.19', '1560711456', '1560711456', '/shop/index.php?cat=c16')

[XT SQL Error]