output: #fixed code
                                  @Override
      public void performAction() {
          AbstractFile targetFile = mainFrame.getActiveTable().getSelectedFile();
          if (targetFile == null) {
              targetFile = mainFrame.getActiveTable().getFileTableModel().getFileAt(0).getParent();
          }
          AbstractFile linkPath = mainFrame.getInactivePanel().getCurrentFolder();
          new CreateSymLinkDialog(mainFrame, linkPath, targetFile).showDialog();
      }
input: #vulnerable code 
                                  @Override
      public void performAction() {
          AbstractFile targetFile = mainFrame.getActiveTable().getSelectedFile();
          if (targetFile == null) {
              targetFile = mainFrame.getInactiveTable().getFileTableModel().getFileAt(0).getParent();
          }
          AbstractFile linkPath = mainFrame.getActivePanel().getCurrentFolder();
          new CreateSymLinkDialog(mainFrame, linkPath, targetFile).showDialog();
      } 
                              #location 5 
                              #vulnerability type NULL_DEREFERENCE