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', 'l7818cbnubq8o4mjcv8o784410', '54.198.212.30', '1540111286', '1540111286', '/catalog/default.php?cPath=51_207&osCsid=3vor4cep52lv3tvp8798lgthu7')

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