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', 'mvmebgkkenpk5h5775pvqjl4k1', '54.198.55.167', '1539787120', '1539787120', '/catalog/default.php?cPath=54_144&osCsid=7366hmbfvgk8c0gmo9f98d7n30')

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