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', '232c87212ed0cbda5d76ab6bab905e69', '3.238.248.200', '1631881800', '1631881800', '/')

[XT SQL Error]