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', '8f31rt5me3b7rfpmq6vpvm6aj0', '54.92.160.119', '1539832321', '1539832321', '/catalog/default.php?cPath=29&osCsid=74e29pk4eg4uf7o1m6m63vb9f0')

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