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', '5pmglh60rd0uk9rl9mlkd5ubg6', '54.162.159.33', '1537512287', '1537512287', '/catalog/default.php?cPath=50_141&osCsid=f0t67sq66l01hup6n8bcfu9g64')

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