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', 'dt71rdjb6klp8tg3qmeo1i1qk0', '216.73.216.111', '1763680675', '1763680675', '/shop_content.php/coID/102/product/Materialerkl--rung--Qualit--tsversprechen-')

[XT SQL Error]