phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '78aa87887c9d74b61961183e53e9c9fc' for key 'PRIMARY'

INSERT INTO phpbb_Alfa_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('78aa87887c9d74b61961183e53e9c9fc', -1, 1784159920, 1784159920, 'd849d98d', 2, 0, 0)

Line : 189
File : sessions.php