1366 - Incorrect integer value: '' for column `pella-ware`.`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', 'o89io11a4epg975u0fgeul1pp5', '3.231.217.209', '1711711110', '1711711110', '/login.php?XTCsid=o89io11a4epg975u0fgeul1pp5')

[XT SQL Error]