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', '8kgk0i06bsd4j2tj09ks4jtrq7', '54.80.83.123', '1537524121', '1537524121', '/catalog/shopping_cart.php?osCsid=k4uj25d2u1l6iii5k2hbgab1o2')

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