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', 'pouh2sqdjj18fdrubnf2dmq407', '18.232.171.18', '1566442262', '1566442262', '/product_info.php?info=p101322_Roco-73831---Elektrolokomotive-1212--NS-Sound-H0.html')

[XT SQL Error]