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', 'mni6q1q3lbpi4onf1ps4jusja6', '54.224.247.42', '1540247093', '1540247093', '/catalog/shopping_cart.php?osCsid=m5puq1abugmhpt6dh75k43rcf2')

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