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', '49991e0kd2dckubf9fj22pdu52', '54.198.52.82', '1537745090', '1537745090', '/catalog/user_agreement.php?osCsid=pq2coo3a244l87sbicast9gjr4')

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