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', 'mc31v808oatq3pcg99362vqep6', '54.80.83.123', '1537837131', '1537837131', '/catalog/product_info.php?name=AKA%20Acrylic%20Paddle%20with%20Crest%20460A&products_id=538')

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