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', 'a91ftmqq857hvbm8pi6u8n16i4', '54.81.150.27', '1537446718', '1537446718', '/catalog/product_info.php?products_id=983&osCsid=ognb5n7d6jsi1jsvllql6g3mk2')

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