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', '4sjbpoe2q4gb9v0u2ldanbo0a6', '54.198.205.153', '1537488037', '1537488037', '/catalog/product_info.php?products_id=544&osCsid=abj3lncob7t2muta8gk9ilmv56')

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