phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a78f9c47b39d1dd0c72e346f65e10cac' 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 ('a78f9c47b39d1dd0c72e346f65e10cac', -1, 1714803714, 1714803714, '12778b32', 0, 0, 0)

Line : 187
File : sessions.php