1366 - Incorrect integer value: '' for column `abtecsho_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', '16cla60qa886r8shd7bm3t0d45', '216.73.216.80', '1767168989', '1767168989', '/product_info.php/info/p5841_KS-5-BG-Stahl-Kohlendioxidloescher.html')

[XT SQL Error]