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', 'n4eue4lfhamks2t4n87g7sv4h2', '54.198.142.121', '1537918012', '1537918012', '/catalog/shopping_cart.php?osCsid=ebmof5e6gh12ojud0o6ic2bbd5')

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