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', 'pnp8nkvg9i86mrs1c99nk6cbi2', '54.224.56.126', '1540287571', '1540287571', '/catalog/login.php?osCsid=15o884pb9f8cjmv7resi84m411')

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