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', '2hb9t5qspn55ofj36vudjjcoq0', '54.81.150.27', '1537447501', '1537447501', '/catalog/password_forgotten.php?osCsid=1u5ppmsfsvv1sbn3fei7luh0d6')

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