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', '8726hn3obh2kqij27hua38ltq7', '54.161.77.30', '1539678924', '1539678924', '/catalog/product_info.php?name=Alpha%20Phi%20Alpha%20Wooden%20Lapel%20Pin%20LGP&products_id=399')

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