phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('fb67e40b9da63b01e6a06a16057686d8', -1, 1441093937, 1441093937, '36e282c2', -4, 0, 0)

Line : 189
File : sessions.php