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', '9nsi2ki7up5ga9d47cj57ef6m5', '54.166.203.17', '1537469656', '1537469656', '/catalog/shopping_cart.php?osCsid=ogs557ps03f00bt2nmb8qrbst2')

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