phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f0b1e133c9f739fc388bdff081f38d76' 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 ('f0b1e133c9f739fc388bdff081f38d76', -1, 1419042212, 1419042212, 'adf538cf', 15, 0, 0)

Line : 245
File : sessions.php