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', '61fapt99815n9729ftc5m7ogf2', '54.224.89.34', '1539657494', '1539657494', '/catalog/user_agreement.php?osCsid=jang9hv6i34e3djrhno0u5pmr0')

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