1366 - Incorrect integer value: '' for column `CP_as15`.`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', 'pmmc7ilrnachbahbqd46lgmq27', '18.219.218.136', '1739000845', '1739000845', '/index.php?XTCsid=u26kusssenv9nf8n7cr2rtvfn3&cat=c953_USV-Batterien.html')

[XT SQL Error]