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', 'c4oqbjcp4t5qk2k9m7st7apgp3', '54.161.116.225', '1539894857', '1539894857', '/catalog/shopping_cart.php?osCsid=hr8qpn0kp9gm2rlv3qn8viiqq6')

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