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', 'rf3s7v3h7e73mdaloaj6e2ctr3', '54.80.102.170', '1534597296', '1534597296', '/catalog/default.php?cPath=47_111&osCsid=208knfh4u1uuuas2qpqgh732k6')

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