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', 'uaj503cps1rq8d8j5rbh2gmua6', '54.166.203.17', '1537346484', '1537346484', '/catalog/user_agreement.php?osCsid=if0vjd0kg42217phsjf152as85')

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