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', '223t7qonu2eksk21p7flj80rs2', '54.161.116.225', '1539910995', '1539910995', '/catalog/login.php?osCsid=cm6oq64d7bfm64c6dpbn95ebb6')

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