phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4f2b9e2bb322b705cfc965e94ec9f249' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4f2b9e2bb322b705cfc965e94ec9f249', -1, 1776443800, 1776443800, 'd849d8d0', -9, 0, 0)

Line : 187
File : sessions.php