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', 'nnc0gpg5uhp901f66dj25sgti7', '54.156.51.193', '1537339324', '1537339324', '/catalog/checkout_confirmation.php?osCsid=j1sjfcuktsk9h64c0ksasv0s55')

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