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', 'im0t2d52om10587jehr6mus4d4', '54.161.100.24', '1539826642', '1539826642', '/catalog/product_info.php?products_id=936&osCsid=d06p40bv7t1ivhe7lp1u5ubgu0')

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