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', 'bh0ovk779t0epid7e3vsb7poa7', '54.166.130.157', '1540322998', '1540322998', '/catalog/product_info.php?products_id=463&osCsid=59bdfsm7dsojsmb9igegi3ja87')

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