phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '1f7969b68f874f65df65824060bb1a45' 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 ('1f7969b68f874f65df65824060bb1a45', -1, 1475070378, 1475070378, '36e30e17', 21, 0, 0)

Line : 205
File : sessions.php