phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b1ffb3e64bc36d0bd5b592a22e975257' 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 ('b1ffb3e64bc36d0bd5b592a22e975257', -1, 1547618617, 1547618617, '36e2194a', 13, 0, 0)

Line : 198
File : sessions.php