phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9f2bdd9462e80be7d48624d2c022df1e' 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 ('9f2bdd9462e80be7d48624d2c022df1e', -1, 1413915835, 1413915835, '36a1b531', -1, 0, 0)

Line : 187
File : sessions.php