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', 'l68uldnoc404oafj2lsqe4dmi2', '54.224.56.126', '1540285564', '1540285564', '/catalog/default.php?cPath=29&osCsid=drk6bfj6p2nbemk3tsk7a3c570')

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