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', 'n3vbq0nvq01tjbat9tp3fsrlq3', '54.156.39.245', '1539737721', '1539737721', '/catalog/user_agreement.php?osCsid=jaoib9ss6aqb210fpiest4b537')

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