phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '67e39ced334fe16c1d6301b5140cde83' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('67e39ced334fe16c1d6301b5140cde83', -1, 1432967983, 1432967983, 'adf538c2', 15, 0, 0)

Line : 245
File : sessions.php