#vulnerable code 
                                protected void outerHtml(StringBuilder accum) {
        new NodeTraversor(new OuterHtmlVisitor(accum, ownerDocument().outputSettings())).traverse(this);
    } 
                            #location 2 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                protected void outerHtml(StringBuilder accum) {
        new NodeTraversor(new OuterHtmlVisitor(accum, getOutputSettings())).traverse(this);
    }