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', 'ulujc7esgjfd19ncleovpgtg50', '54.198.142.121', '1537422447', '1537422447', '/catalog/default.php?cPath=52&osCsid=6mblkm1ovouoq14phqntgp4lh0')

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