phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '1b8f64c6206c05d434832be8501a56b5' 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 ('1b8f64c6206c05d434832be8501a56b5', -1, 1769412451, 1769412451, 'd849d83c', 1, 0, 0)

Line : 187
File : sessions.php