1366 - Incorrect integer value: '' for column `evanzo_baumi`.`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', '738dac90b1e2d40b9df0735b23110f60', '3.128.188.223', '1744053858', '1744053858', '/product_info.php/info/p18_Ultra-feiner-blauer-Natur--Wasserabziehstein-Thueringer-Art.html')

[XT SQL Error]