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', 'l1qof7d4ee2ii4k69svrrk8l77', '54.92.160.119', '1539708005', '1539708005', '/catalog/shopping_cart.php?osCsid=8glv3ddah3jl0lu14i1h4l4nb2')

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