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', '3cnk6dn1kjjlhj3j7jt5mu4mc6', '54.80.83.123', '1537840743', '1537840743', '/catalog/product_info.php?products_id=404&osCsid=6k7f1jlqkigs5ks50q7arjf9i6')

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