output: #fixed code
                                  private static String ihVal(String key, Document doc) {
          final Element first = doc.select("th:contains(" + key + ") + td").first();
          return first != null ? first.text() : null;
      }
input: #vulnerable code 
                                  private static String ihVal(String key, Document doc) {
          return doc.select("th:contains(" + key + ") + td").first().text();
      } 
                              #location 2 
                              #vulnerability type NULL_DEREFERENCE