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', '509h85qsv54niue6s1e0agmrj5', '54.80.140.29', '1534510613', '1534510613', '/catalog/default.php?osCsid=c52cp36d396s8qbofbq7p8fgl5')

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