Need work folders.class.php

[DobroFenix]

I looked in version 3.1.1, but there is none at all.
Has anyone already fixed?
Warning: Undefined variable $newId in /var/www/pass/sources/folders.class.php on line 422

I tried to write a simple query to the database, but it is not written either - the problem is not in the database, but in the execution code of the sql query itself. (The database structure has been brought into line so that only parent_id accepts)
DB::insert(
prefixTable('nested_tree'),
array(
"parent_id" => "555",

            )
        );