phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '461a5cb2c42926e146ff898cdf06f20c' 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 ('461a5cb2c42926e146ff898cdf06f20c', -1, 1398298129, 1398298129, '36cdcd2f', -1, 0, 0)

Line : 187
File : sessions.php