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', '3v0at75t5outumkhek09u2qr22', '54.161.116.225', '1539907321', '1539907321', '/catalog/product_info.php?products_id=399&osCsid=j1pn1935g4mf5367pc76idh9t1')

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