phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '660cf021885cb2db9b8689d26c7fc426' 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 ('660cf021885cb2db9b8689d26c7fc426', -1, 1550462517, 1550462517, '36d23d29', -9, 0, 0)

Line : 198
File : sessions.php