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', 'u9aknlms3s0i07t2buqdnopvt6', '54.156.39.245', '1539739369', '1539739369', '/catalog/default.php?cPath=54_255&osCsid=jss3de1sokfb661qqgdi8htd11')

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