phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO forum_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('e47f11185d50cc9254231a7ca450b4ac', -1, 1417237300, 1417237300, '365a42ed', 2, 0, 0)

Line : 187
File : sessions.php