1366 - Incorrect integer value: '' for column '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', '44f0crlemsnjtl09jv6bg8dmb4', '3.81.28.10', '1593929468', '1593929468', '/')

[XT SQL Error]