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', '6sp4tfpfldn86imrhefuv7f4e1', '54.198.142.121', '1537925683', '1537925683', '/catalog/product_info.php?products_id=872&osCsid=1oc541tjgn46o3175glld5n8a4')

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