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', '4bjk36kc1t28qkud4utf4etcn2', '54.162.133.222', '1539903534', '1539903534', '/catalog/default.php?cPath=53&osCsid=kaeqam1bu58ca1ev3lpkt04eo3')

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