phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8bd29fd03e638dc2ad5b4dd39b8fbe36' for key 1

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('8bd29fd03e638dc2ad5b4dd39b8fbe36', -1, 1369017645, 1369017645, '1716d49e', -1, 0, 0)

Line : 187
File : sessions.php