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', '093g769o2f4lqsfaa45fvsq896', '54.198.15.20', '1540357100', '1540357100', '/catalog/shopping_cart.php?osCsid=n6jd6oh9he19k05hklfigldpc7')

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