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', 'c3bpiuqmr9i6st0dj594lb6va1', '54.198.96.198', '1534422786', '1534422786', '/catalog/shopping_cart.php?osCsid=d3dh6tvlmg0jjepulfb1rvnjq3')

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