phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '44714d8fb38a5d32121540659570b50c' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('44714d8fb38a5d32121540659570b50c', -1, 1422585475, 1422585475, '3652a46a', 1, 0, 0)

Line : 187
File : sessions.php