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', 'j2aha6elb65slvecv02t45dfb0', '54.81.150.27', '1537439213', '1537439213', '/catalog/default.php?cPath=56_172&osCsid=cjmsn8hk8ob7eaeun75d4jusi6')

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