phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c979f9f19f918c7b783fd213c039d96c' 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 ('c979f9f19f918c7b783fd213c039d96c', -1, 1781137721, 1781137721, 'd849d98c', -4, 0, 0)

Line : 187
File : sessions.php