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', '1fqai9ukv89asfgmi53lh0p214', '54.80.87.166', '1540313530', '1540313530', '/catalog/create_account.php?osCsid=8glv3ddah3jl0lu14i1h4l4nb2')

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