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', 'iahuc2e1q8qlnk30mo97r3bcq6', '3.209.80.217', '1571010055', '1571010055', '/shop/')

[XT SQL Error]