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', 'uup0frodsb4km2l8np7hck0ka1', '54.158.52.166', '1537359956', '1537359956', '/catalog/shopping_cart.php?osCsid=9lukq4o4nukvlhll6frj12ocg7')

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