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', 'j8b22v31e9ss4u8nafbua93ct6', '54.196.26.1', '1539622244', '1539622244', '/catalog/login.php?osCsid=c6vd1j8qd09rntbfnd2sijsee0')

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