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', '76baokgccb72vdfik6l7sm1943', '54.161.71.87', '1537336268', '1537336268', '/catalog/product_info.php?cPath=54_147&products_id=981&osCsid=u5v9cmoe2br2a0f1958odshv22')

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