phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9a6918f839392788bd0bf97601b57d7d' 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 ('9a6918f839392788bd0bf97601b57d7d', -1, 1776760468, 1776760468, 'd849d8d8', -9, 0, 0)

Line : 187
File : sessions.php