phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '878ce800d1c87ddb95f924d2a2dd7c15' 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 ('878ce800d1c87ddb95f924d2a2dd7c15', -1, 1765349096, 1765349096, 'd849d81d', 1, 0, 0)

Line : 187
File : sessions.php