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', 't1k3ha9pjqckmeje7haf5akt44', '54.198.55.167', '1539783208', '1539783208', '/catalog/shopping_cart.php?osCsid=j1pn1935g4mf5367pc76idh9t1')

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