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', 'rrd9ggk75bne60560e0eh5sb41', '54.158.208.189', '1539632579', '1539632579', '/catalog/privacy.php?osCsid=6mip9jkn3jj2qbc3ld849eoim2')

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