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', 'vmnn1spo3knuulft21h5cflss2', '54.196.5.6', '1534623351', '1534623351', '/catalog/user_agreement.php?osCsid=1i5ku17e5f6k8nta6i80h8ql50')

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