1366 - Incorrect integer value: '' for column `wwwmodellbahn_diskont1`.`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', 'mesen723hp23nvmh14s6j3ukj6', '18.232.171.18', '1566441411', '1566441411', '/product_info.php?products_id=104782')

[XT SQL Error]