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', 'j66ka0e97b0lc8cudb0p8cvlb2', '54.92.160.119', '1540074521', '1540074521', '/catalog/checkout_confirmation.php?osCsid=70nkcg3r507ftm8ge2d30k7635')

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