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', 'br9bam2hk86ldve8l9h57hmok1', '54.198.212.30', '1539854643', '1539854643', '/catalog/default.php?cPath=51_210&osCsid=i47api1qfu6ae3t960otbjhgk5')

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