Program: 35209
Project: 35209
Buggy source:
public void addNodes(ClassNode cn,MethodNode mn){
  DefaultListModel<TCBEntry> model=new DefaultListModel<>();
  this.setFont(new Font(Font.SANS_SERIF,Font.PLAIN,13));
  for (  TryCatchBlockNode tcbn : mn.tryCatchBlocks) {
    model.addElement(new TCBEntry(cn,mn,tcbn));
  }
  this.setModel(model);
  this.addMouseListener(new MouseAdapter(){
    public void mousePressed(    MouseEvent e){
      if (SwingUtilities.isRightMouseButton(e)) {
        TCBEntry selected=TCBList.this.getSelectedValue();
        JPopupMenu menu=new JPopupMenu();
        if (selected != null) {
          JMenuItem remove=new JMenuItem(JByteMod.res.getResource("String_Node_Str"));
          remove.addActionListener(new ActionListener(){
            public void actionPerformed(            ActionEvent e){
              ClassNode cn=selected.getCn();
              MethodNode mn=selected.getMn();
              mn.tryCatchBlocks.remove(selected.getTcbn());
              TCBList.this.addNodes(cn,mn);
            }
          }
);
          menu.add(remove);
          JMenuItem edit=new JMenuItem(JByteMod.res.getResource("String_Node_Str"));
          edit.addActionListener(new ActionListener(){
            public void actionPerformed(            ActionEvent e){
              try {
                if (selected.getTcbn().type == null) {
                  selected.getTcbn().type="String_Node_Str";
                }
                new InsnEditDialogue(mn,selected.getTcbn()).open();
                if (selected.getTcbn().type != null && selected.getTcbn().type.equals("String_Node_Str")) {
                  selected.getTcbn().type=null;
                }
              }
 catch (              Exception ex) {
                new ErrorDisplay(ex);
              }
              TCBList.this.addNodes(cn,mn);
            }
          }
);
          menu.add(edit);
        }
        JMenuItem insert=new JMenuItem(selected != null ? JByteMod.res.getResource("String_Node_Str") : JByteMod.res.getResource("String_Node_Str"));
        insert.addActionListener(new ActionListener(){
          public void actionPerformed(          ActionEvent e){
            try {
              TryCatchBlockNode tcbn=new TryCatchBlockNode(null,null,null,null);
              if (new InsnEditDialogue(mn,tcbn).open())               if (tcbn.handler != null && tcbn.start != null && tcbn.end != null) {
                if (tcbn.type != null && tcbn.type.equals("String_Node_Str")) {
                  tcbn.type=null;
                }
                mn.tryCatchBlocks.add(tcbn);
              }
            }
 catch (            Exception ex) {
              new ErrorDisplay(ex);
            }
            TCBList.this.addNodes(cn,mn);
          }
        }
);
        menu.add(insert);
        menu.show(TCBList.this,e.getX(),e.getY());
      }
    }
  }
);
}

Fixed version (ground truth):
public void addNodes(ClassNode cn,MethodNode mn){
  DefaultListModel<TCBEntry> model=new DefaultListModel<>();
  this.setFont(new Font(Font.SANS_SERIF,Font.PLAIN,13));
  for (  TryCatchBlockNode tcbn : mn.tryCatchBlocks) {
    model.addElement(new TCBEntry(cn,mn,tcbn));
  }
  this.setModel(model);
  this.addMouseListener(new MouseAdapter(){
    public void mousePressed(    MouseEvent e){
      if (SwingUtilities.isRightMouseButton(e)) {
        TCBEntry selected=TCBList.this.getSelectedValue();
        JPopupMenu menu=new JPopupMenu();
        if (selected != null) {
          JMenuItem remove=new JMenuItem(JByteMod.res.getResource("String_Node_Str"));
          remove.addActionListener(new ActionListener(){
            public void actionPerformed(            ActionEvent e){
              ClassNode cn=selected.getCn();
              MethodNode mn=selected.getMn();
              mn.tryCatchBlocks.remove(selected.getTcbn());
              TCBList.this.addNodes(cn,mn);
            }
          }
);
          menu.add(remove);
          JMenuItem edit=new JMenuItem(JByteMod.res.getResource("String_Node_Str"));
          edit.addActionListener(new ActionListener(){
            public void actionPerformed(            ActionEvent e){
              try {
                if (selected.getTcbn().type == null) {
                  selected.getTcbn().type="String_Node_Str";
                }
                new InsnEditDialogue(mn,selected.getTcbn()).open();
                if (selected.getTcbn().type != null && selected.getTcbn().type.equals("String_Node_Str")) {
                  selected.getTcbn().type=null;
                }
              }
 catch (              Exception ex) {
                new ErrorDisplay(ex);
              }
              TCBList.this.addNodes(cn,mn);
            }
          }
);
          menu.add(edit);
        }
        JMenuItem insert=new JMenuItem(selected != null ? JByteMod.res.getResource("String_Node_Str") : JByteMod.res.getResource("String_Node_Str"));
        insert.addActionListener(new ActionListener(){
          public void actionPerformed(          ActionEvent e){
            try {
              TryCatchBlockNode tcbn=new TryCatchBlockNode(null,null,null,"String_Node_Str");
              if (new InsnEditDialogue(mn,tcbn).open())               if (tcbn.handler != null && tcbn.start != null && tcbn.end != null) {
                if (tcbn.type != null && tcbn.type.equals("String_Node_Str")) {
                  tcbn.type=null;
                }
                mn.tryCatchBlocks.add(tcbn);
              }
            }
 catch (            Exception ex) {
              new ErrorDisplay(ex);
            }
            TCBList.this.addNodes(cn,mn);
          }
        }
);
        menu.add(insert);
        menu.show(TCBList.this,e.getX(),e.getY());
      }
    }
  }
);
}