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', 'euc8umheam432hr0qctcc322a2', '54.198.142.121', '1537918504', '1537918504', '/catalog/product_info.php?products_id=431&osCsid=74e29pk4eg4uf7o1m6m63vb9f0')

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