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', 'u66en5qfh113q8913p8d6bvn85', '54.158.208.189', '1539630081', '1539630081', '/catalog/shopping_cart.php?osCsid=tl6go4osa5lg4s4chqjhjhi7f7')

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