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', '4jjo4ep3vto0uu4mjvh671a306', '54.166.130.157', '1540322546', '1540322546', '/catalog/default.php?cPath=52_187&osCsid=ms9278h4k02kkpg1d5t5uvjpq4')

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