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', 'r4jcpo3qqntvn15ncdh29f88h0', '54.92.163.105', '1539650144', '1539650144', '/catalog/shopping_cart.php?osCsid=ecmc9ia7uh3q1ifk454tm8c3r5')

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