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', 'udme4jsmpv7i76b54absobg621', '54.80.188.87', '1540124104', '1540124104', '/catalog/product_info.php?products_id=707&osCsid=dd67tpab021tqla2ugp4prl9g4')

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