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', '5nbad6h2mfvffl2rd5u9aicch0', '54.224.89.34', '1539655456', '1539655456', '/catalog/default.php?osCsid=ul5eddknpcfjabdtff6i3n2o30')

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