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', 'd6ktml23g9r6744ht60fubl9f7', '54.80.96.153', '1537387768', '1537387768', '/catalog/default.php?cPath=51_211&osCsid=bpjv8mp6816sl4329ufsm845h5')

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