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', '48qcdja3m8mbi91pbpbtva0h11', '54.92.160.119', '1539705591', '1539705591', '/catalog/default.php?cPath=47_114&osCsid=fu22o843atdr0d5bp0bmbapet0')

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