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', '4c8ldhav99re7f8lf37ut72136', '54.161.71.87', '1537370926', '1537370926', '/catalog/default.php?cPath=47_111&osCsid=3cti8nelnek7ngb6tr2f2t1g85')

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