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', '2cfu83ka8al0j67m3qe5ea6v81', '54.80.96.153', '1537787788', '1537787788', '/catalog/product_info.php?name=Kappa%20Alpha%20Psi%20key%20chain%20-%20SPK&products_id=451')

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