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', 'b0d36bih9cn3in9djvca3u5sr1', '3.81.28.94', '1566504293', '1566504293', '/product_info.php?cPath=&info=p105269_Brekina-39063---Unimog-402-mit-Holzladung--tannengruen-1-87.html')

[XT SQL Error]