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', 'f5b28uh29noir76jmn86csp7k5', '54.224.56.126', '1539841714', '1539841714', '/catalog/password_forgotten.php?osCsid=9jn7i7p3pdbo83bud78fjothu4')

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