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', '4nd2oit9n5g7otsd2f25tg9hb7', '54.198.212.30', '1539856595', '1539856595', '/catalog/products_new.php?osCsid=dd67tpab021tqla2ugp4prl9g4')

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