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', 'k5stkbuvg09l07dk1psvat5vk3', '54.156.51.193', '1537340329', '1537340329', '/catalog/checkout_confirmation.php?osCsid=vvadb46eeid02hgl8tvc1bd555')

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