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', '4tkpiflibbg909maahki33tba7', '3.144.91.201', '1746792863', '1746792863', '/xtshop/index.php')

[XT SQL Error]