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', 'o34u855tb5tv3jm30jloocrbf3', '3.81.28.94', '1566505782', '1566505782', '/product_info.php?cPath=&info=p105284_Donau-HA05---Abzweigklemmverbinder-0-2---0-5-mm-.html')

[XT SQL Error]