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', '9pfel237hjeum5r3qu9gmrthm5', '54.166.141.69', '1537380951', '1537380951', '/catalog/user_agreement.php?osCsid=g6hccmqqmlkdons7a59puol9h4')

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