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', 'b60ce57f6ee322e9b3582cea62eadf68', '3.144.254.237', '1722090170', '1722090170', '/index.php/cat/c3_andere-Bienenprodukte.html')

[XT SQL Error]