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', 'n9gvu1bee4kmpalqi1h8ta31d2', '54.80.87.166', '1540314813', '1540314813', '/catalog/product_info.php?name=Kappa%20Alpha%20Psi%20License%20Plate-%20DMTB_7206&products_id=427')

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