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', 'nc19hm0j2bu0tksi8bmnaui214', '54.80.87.166', '1539618120', '1539618120', '/catalog/default.php?cPath=47_117&osCsid=805mnhtgl18pa4053m3pd2m380')

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