1366 - Incorrect integer value: '' for column `hbl_shop`.`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', 'pm6nib3tlookjfmrk9t2m1bm04', '216.73.216.35', '1770047843', '1770047843', '/index.php?cat=c64_Zubehoer-Elektrodaempfer.html')

[XT SQL Error]