#fixed code
                              protected Rectangle computeBoundingBox(Collection<? extends Shape> shapes, SpatialContext ctx) {
    if (shapes.isEmpty())
      return ctx.makeRectangle(Double.NaN, Double.NaN, Double.NaN, Double.NaN);
    BBoxCalculator bboxCalc = new BBoxCalculator(ctx);
    for (Shape geom : shapes) {
      bboxCalc.expandRange(geom.getBoundingBox());
    }
    return bboxCalc.getBoundary();
  }
#vulnerable code 
                              protected Rectangle computeBoundingBox(Collection<? extends Shape> shapes, SpatialContext ctx) {
    if (shapes.isEmpty())
      return ctx.makeRectangle(Double.NaN, Double.NaN, Double.NaN, Double.NaN);
    Range xRange = null;
    double minY = Double.POSITIVE_INFINITY;
    double maxY = Double.NEGATIVE_INFINITY;
    for (Shape geom : shapes) {
      Rectangle r = geom.getBoundingBox();

      Range xRange2 = Range.xRange(r, ctx);
      if (xRange == null) {
        xRange = xRange2;
      } else {
        xRange = xRange.expandTo(xRange2);
      }
      minY = Math.min(minY, r.getMinY());
      maxY = Math.max(maxY, r.getMaxY());
    }
    return ctx.makeRectangle(xRange.getMin(), xRange.getMax(), minY, maxY);
  } 
                            #location 19 
                            #vulnerability type NULL_DEREFERENCE