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', 'hn5j6jh0aed6a0bk3cgk8jr4j3', '54.224.247.42', '1540248537', '1540248537', '/catalog/shopping_cart.php?osCsid=8n4vco4jpoed68pv4vlsvfr2j5')

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