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', '5ab6ed6b3b0erkgu4b7uc8lnq1', '54.224.118.247', '1540076893', '1540076893', '/catalog/default.php?cPath=52&osCsid=f9lrctcqi8ucu09vbfdvpllsq0')

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