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', 'm9drvdoekco8gv4ugkkqk2c0i7', '54.198.52.82', '1537746433', '1537746433', '/catalog/shipping.php?osCsid=vtq0ta32al27fqmf1aa60g7060')

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