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', 'h59oi8ccnkn8c0o3gqciim2rj7', '54.224.247.42', '1540206651', '1540206651', '/catalog/default.php?cPath=56&osCsid=krhkuqs29bf5tdi30t0ln5g356')

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