phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4975d94f0ec444ebbe00330ceeb466f8' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4975d94f0ec444ebbe00330ceeb466f8', -1, 1231373102, 1231373102, '26673f3b', 394, 0, 0)

Line : 193
File : sessions.php