code has bug

in org.apache.pdfbox.rendering.PageDrawer.java

// return border info. BorderStyle must be provided as parameter because
// method is not available in the base class
private AnnotationBorder getAnnotationBorder(PDAnnotation annotation,
PDBorderStyleDictionary borderStyle)
{
AnnotationBorder ab = new AnnotationBorder();

COSArray border = annotation.getBorder();
if (borderStyle == null)
{
// this code may throw NullPointerException
if (border.get(2) instanceof COSNumber)

{ ab.width = ((COSNumber) border.getObject(2)).floatValue(); }

if (border.size() > 3)
{
COSBase base3 = border.getObject(3);
if (base3 instanceof COSArray)

{ ab.dashArray = ((COSArray) base3).toFloatArray(); }

}
}

i can not find the pdf file that has this promble.