1366 - Incorrect integer value: '' for column `usr_web74_1`.`whos_online`.`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', 'tp99vr68qnqspid7h1rrfksql0', '216.73.216.80', '1761210041', '1761210041', '/index.php?cat=c48_Einkaufskoerbe-rund-XL.html')

[XT SQL Error]