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', '38obnee5jnoffu66m963t35cb6', '3.147.60.47', '1743539788', '1743539788', '/')

[XT SQL Error]