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', '7l2kgsku970gse4q05hms5rua1', '18.232.171.18', '1566445842', '1566445842', '/product_info.php?info=p103763_Micro-Welten-2-22-Sonnblick-Spur-N.html')

[XT SQL Error]