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', 'ks6hi3ch9btsufqbbv9dgfd1k6', '54.145.83.79', '1539750159', '1539750159', '/catalog/default.php?cPath=56&osCsid=m5hoianmc0q0h3pf88thfu27m5')

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