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', 'opktq9j1ecqnu3nbhjs44k2ht5', '54.92.160.119', '1540069735', '1540069735', '/catalog/product_info.php?products_id=488&osCsid=d06p40bv7t1ivhe7lp1u5ubgu0')

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