1366 - Incorrect integer value: '' for column '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', 'vh9jdgi9alc6ogbsm72nelobo3', '54.198.23.251', '1537409394', '1537409394', '/catalog/product_info.php?name=Delta%20Sigma%20Theta%20Acrylic%20Vertical%20Outline%20Clear%20Keychain%20AVOC&products_id=941')

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