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', 'a8t56j1s7fnf4jkgk8c9abiiv7', '54.80.87.166', '1539619586', '1539619586', '/catalog/default.php?cPath=51_210&osCsid=rbairlj6lekttgj7teb1lkve83')

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