phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6341e2cf0fbcf791e7a34624cf5a4e8f' 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 ('6341e2cf0fbcf791e7a34624cf5a4e8f', -1, 1771010427, 1771010427, 'd849d88a', -4, 0, 0)

Line : 187
File : sessions.php