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', 'm9mv99cd921j4dtqf5l65ui422', '54.156.51.193', '1537311378', '1537311378', '/catalog/contact_us.php?osCsid=k1hgol21gfbtmfed59tsdmoiq1')

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