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', '933qbcfocf8cjuslt3tp3i6261', '216.73.216.31', '1758226011', '1758226011', '/product_info.php/info/p6341_Hydranten-Kennzeichnung-mit-Beispiel.html')

[XT SQL Error]