#fixed code
                                protected static void denormalizeX(Dataset data, Map<Object, Double> minColumnValues, Map<Object, Double> maxColumnValues) {
        for(Integer rId : data) {
            Record r = data.get(rId);
            AssociativeArray xData = new AssociativeArray(r.getX());
            
            for(Object column : minColumnValues.keySet()) {
                Double value = xData.getDouble(column);
                if(value==null) { //if we have a missing value don't perform any denormalization
                    continue;
                }
                
                Double min = minColumnValues.get(column);
                Double max = maxColumnValues.get(column);
                
                if(min.equals(max)) {
                    xData.put(column, min);
                }
                else {
                    xData.put(column, value*(max-min) + min);
                }
            }
            
            r = new Record(xData, r.getY(), r.getYPredicted(), r.getYPredictedProbabilities());
            data.set(rId, r);
        }
    }
#vulnerable code 
                                protected static void denormalizeX(Dataset data, Map<Object, Double> minColumnValues, Map<Object, Double> maxColumnValues) {
        for(Integer rId : data) {
            Record r = data.get(rId);
            for(Object column : minColumnValues.keySet()) {
                Double value = r.getX().getDouble(column);
                if(value==null) { //if we have a missing value don't perform any denormalization
                    continue;
                }
                
                Double min = minColumnValues.get(column);
                Double max = maxColumnValues.get(column);
                
                if(min.equals(max)) {
                    r.getX().put(column, min);
                }
                else {
                    r.getX().put(column, value*(max-min) + min);
                }
            }
            
            //do nothing for the response variable Y
        }
    } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE