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', '1kfo4kjak945bg7tgg76u8cgq7', '54.156.51.193', '1537315690', '1537315690', '/catalog/product_info.php?name=Omega%20Psi%20Phi%20Plastic%20License%20Plate%20Holder%20-%20PFW_4108&products_id=817')

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