phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'fa0de4638572ea19dc3c01fb55aef565' for key 1

INSERT INTO phpbb_stu_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('fa0de4638572ea19dc3c01fb55aef565', -1, 1369025007, 1369025007, '1716d49e', -10, 0, 0)

Line : 251
File : sessions.php