phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f61e7fb17d60a653ff71cb502176a2ac' 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 ('f61e7fb17d60a653ff71cb502176a2ac', -1, 1411424426, 1411424426, '365ce764', 1, 0, 0)

Line : 245
File : sessions.php