In the categories_config.php calculated field "CurrentSort" is used without table alias. This may be a problem if customization requires additional join. For example, on same Categories table to get access to some parent category field values. In this case we get a problem to avoid SQL error "1052: Column 'ParentPath' in field list is ambiguous".
categories_config.php
'CalculatedFields' => Array (
'' => Array (
'CurrentSort' => "REPLACE(ParentPath, CONCAT('|', ".'%1$s'.".CategoryId, '|'), '')",
I suggest use before ParentPath same prefix '%1$s' as before CategoryId field.