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', 'vk3cteokad3v91uikbbrpiftd1', '54.156.39.245', '1539608537', '1539608537', '/catalog/default.php?cPath=48_153&osCsid=6nkugtbpv3rck81in4amd2pe47')

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