Custom ListView 스크롤시 에러

Question

public class CustomAdapter extends BaseAdapter {
    public class ListContents{
        String msg;
        int type;
        ListContents(String _msg,int _type)
        {
            this.msg = _msg;
            this.type = _type;
        }
    }

    ArrayList<ListContents> m_List;

    CustomAdapter(){
        m_List = new ArrayList<ListContents>();
    }

    public void add(String _msg, int _type){
        m_List.add(new ListContents(_msg, _type));
    }

    public void remove(int _position){
        m_List.remove(_position);
    }


    @Override
    public int getCount() {
        return m_List.size();
    }

    @Override
    public Object getItem(int position) {
        return m_List.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final int pos = position;
        final Context context =parent.getContext();

        TextView text = null;
        CustomHolder holder = null;
        LinearLayout layout = null;
        View viewRight = null;
        View viewLeft = null;

        if(convertView == null){
            LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.custom_list, parent, false);

            layout = (LinearLayout)convertView.findViewById(R.id.layout);
            text = (TextView)convertView.findViewById(R.id.text);
            viewRight = (View) convertView.findViewById(R.id.imageViewright);
            viewLeft = (View) convertView.findViewById(R.id.imageViewleft);

            holder = new CustomHolder();
            holder.m_TextView   = text;
            holder.layout = layout;
            convertView.setTag(holder);
        }else{
            holder  = (CustomHolder) convertView.getTag();
            text    = holder.m_TextView;
            layout  = holder.layout;
            viewRight = holder.viewRight;
            viewLeft = holder.viewLeft;
        }

        text.setText(m_List.get(position).msg);

        if(m_List.get(position).type == 0){
            text.setBackgroundResource(R.drawable.inbox2);
            layout.setGravity(Gravity.LEFT);
            viewLeft.setVisibility(View.GONE);
            viewRight.setVisibility(View.GONE);
        }else if(m_List.get(position).type == 1){
            text.setBackgroundResource(R.drawable.outbox2);
            layout.setGravity(Gravity.RIGHT);
            viewLeft.setVisibility(View.GONE);
            viewRight.setVisibility(View.GONE);
        }else if(m_List.get(position).type == 2){
            text.setBackgroundResource(R.drawable.datebg);
            layout.setGravity(Gravity.CENTER);
            viewLeft.setVisibility(View.GONE);
            viewRight.setVisibility(View.GONE);
        }

        return convertView;
    }

    private class CustomHolder {
        TextView    m_TextView;
        LinearLayout    layout;
        View viewRight;
        View viewLeft;
    }
}
커스텀 리스트뷰 사용하는데

스크롤을 끝까지내리면 팅겨버리네요 왜이럴까요 ㅜㅜ

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