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Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO data_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('070ba0dff4cbf46df3584934e6913d97', -1, 1472385802, 1472385802, '36c6e3c4', -1, 0)

Line : 152
File : /home/ebookira/domains/ebookiran.ir/public_html/users/includes/sessions.php