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', 'e58ea24bdf1f30a9aeea8f614f058c38', '44.201.95.84', '1664913198', '1664913198', '/shop/index.php')

[XT SQL Error]