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', '12uf0k0s6q7ut3278qhp306vs5', '54.166.203.17', '1537467689', '1537467689', '/catalog/shopping_cart.php?page=1&osCsid=4vnj244c87a5nem3j7986rda63')

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