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', 'fh8p9jl15cf46q74tenrd9lg43', '54.156.51.193', '1537340735', '1537340735', '/catalog/shopping_cart.php?osCsid=cagvnfvhvhqqe64dmoc1vq80g4')

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