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', 'b9e607a1399b721e13c2638d47db59d5', '18.221.98.71', '1714073529', '1714073529', '/index.php/cat/c2_Honig-500-g.html/page/2')

[XT SQL Error]