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', '8b6thmbc5fj318gagkv5s9hu71', '54.196.42.8', '1534666983', '1534666983', '/catalog/checkout_confirmation.php?osCsid=5b0ch0c0e10sf2bv9pdnh57si2')

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