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', 'vdercsmm6v6v1blhbsfbevi9v1', '54.156.51.193', '1537313306', '1537313306', '/catalog/product_info.php?name=Sigma%20Gamma%20Rho%20License%20Plate%20-%20DMTS_7003&products_id=592')

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