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', '3he4u0pfc1edo867rc2suhpuj4', '54.166.207.223', '1539816096', '1539816096', '/catalog/default.php?cPath=49_180&osCsid=oqajt8bgtfvgbobrb8p4sjoa14')

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