#fixed code
                              @Override
  public void modifyTable(TableName tableName, TableDescriptor tableDescriptor) throws IOException {
    super.modifyTable(tableName, new HTableDescriptor(tableDescriptor));
  }
#vulnerable code 
                              @Override
  public void modifyTable(TableName tableName, TableDescriptor tableDescriptor) throws IOException {
    if (isTableAvailable(tableName)) {
      TableDescriptor currentTableDescriptor = getTableDescriptor(tableName);
      List<Modification> modifications = new ArrayList<>();
      List<HColumnDescriptor> columnDescriptors = tableAdapter2x.toHColumnDescriptors(tableDescriptor);
      List<HColumnDescriptor> currentColumnDescriptors = tableAdapter2x.toHColumnDescriptors(currentTableDescriptor);
      modifications.addAll(tableModificationAdapter.buildModifications(columnDescriptors, currentColumnDescriptors));
      modifyColumn(tableName, "modifyTable", "update", (Modification[]) modifications.toArray());
    } else {
      throw new TableNotFoundException(tableName);
    }
  } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE