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', 'hocgsnp4kjb9u47650h30729u2', '54.198.55.167', '1539753252', '1539753252', '/catalog/default.php?cPath=51_214&osCsid=omp4q22vr3mrsi3lhb5t8bstn6')

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