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', '3hlf2eksspkmgd2fip6f7jkaq7', '54.161.77.30', '1540295522', '1540295522', '/catalog/product_notifications.php?osCsid=ikh43r3o4ube2orm93dunqmj14')

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