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', 'ef7u3783r5vvle76ki7i8e9l12', '54.166.203.17', '1537321546', '1537321546', '/catalog/shopping_cart.php?osCsid=ikh43r3o4ube2orm93dunqmj14')

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