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', 'os816d75kbjb494iv72lq3lof1', '216.73.216.6', '1752291637', '1752291637', '/shop_content.php/coID/7/content/Kontakt')

[XT SQL Error]