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', 'j9k28pj0s2paanl3nle1u7t9g7', '54.80.188.87', '1540004008', '1540004008', '/catalog/product_info.php?products_id=530&osCsid=208knfh4u1uuuas2qpqgh732k6')

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