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', 'e5f93d3b14285d38d8289ebbb4e80991', '3.237.34.21', '1709262552', '1709262552', '/index.php')

[XT SQL Error]