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', '1v0p3i0ni6o81477864bgcba16', '54.198.52.82', '1537845854', '1537845854', '/catalog/default.php?cPath=29_239&osCsid=jrmf80e8f8tn7p6e8i5tot18o5')

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