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', 'db81mshrk2ombc65eoqbu55on2', '54.80.87.166', '1540313583', '1540313583', '/catalog/product_info.php?products_id=152&osCsid=5h29r0j38ra19k5p2421qba997')

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