phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '85b37670403364a7d1c2f14e2fb8b434' 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 ('85b37670403364a7d1c2f14e2fb8b434', -1, 1398340342, 1398340342, '6b16258f', 17, 0, 0)

Line : 292
File : sessions.php