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', 'cknollp9su99fptn40q0tm2ih5', '54.198.15.20', '1540361089', '1540361089', '/catalog/default.php?cPath=47_120&osCsid=j067i8f03n98013g6g3qhdh360')

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