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', 'i30bjl9gbfc8k4i0sg9l6r3k35', '54.80.188.87', '1539844909', '1539844909', '/catalog/login.php?osCsid=gejudcbuqig9k5nq2k41acknc5')

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