Program: 86163
Project: 86163
Buggy source:
public void prolongAllDo(){
  MultiStepResultHelper<Void> msrhProlong=new MultiStepResultHelper<>(getActivity(),null,R.string.doing_prolong_all);
  msrhProlong.setCallback(new Callback<Void>(){
    @Override public void onSuccess(    MultiStepResult result){
      if (getActivity() == null) {
        return;
      }
      ProlongAllResult res=(ProlongAllResult)result;
      AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
      if (res.getResults() != null) {
        LayoutInflater inflater=getLayoutInflater(null);
        View view=inflater.inflate(R.layout.dialog_simple_list,null,false);
        ListView lv=(ListView)view.findViewById(R.id.lvBibs);
        lv.setAdapter(new ProlongAllResultAdapter(getActivity(),res.getResults()));
switch (result.getActionIdentifier()) {
case ReservationResult.ACTION_BRANCH:
          builder.setTitle(R.string.branch);
      }
      builder.setView(view).setNeutralButton(R.string.close,new DialogInterface.OnClickListener(){
        @Override public void onClick(        DialogInterface dialog,        int id){
          adialog.cancel();
          invalidateData();
        }
      }
);
    }
 else {
      builder.setMessage(result.getMessage()).setCancelable(true).setNegativeButton(R.string.close,new DialogInterface.OnClickListener(){
        @Override public void onClick(        DialogInterface d,        int id){
          d.cancel();
        }
      }
).setOnCancelListener(new DialogInterface.OnCancelListener(){
        @Override public void onCancel(        DialogInterface d){
          if (d != null) {
            d.cancel();
          }
        }
      }
);
    }
    adialog=builder.create();
    adialog.show();
  }
  @Override public void onError(  MultiStepResult result){
    if (getActivity() == null) {
      return;
    }
    AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
    builder.setMessage(result.getMessage()).setCancelable(true).setNegativeButton(R.string.close,new DialogInterface.OnClickListener(){
      @Override public void onClick(      DialogInterface d,      int id){
        d.cancel();
      }
    }
).setOnCancelListener(new DialogInterface.OnCancelListener(){
      @Override public void onCancel(      DialogInterface d){
        if (d != null) {
          d.cancel();
        }
      }
    }
);
    AlertDialog alert=builder.create();
    alert.show();
  }
  @Override public void onUnhandledResult(  MultiStepResult result){
  }
  @Override public void onUserCancel(){
  }
  @Override public StepTask<?> newTask(  MultiStepResultHelper helper,  int useraction,  String selection,  Void argument){
    return new ProlongAllTask(helper,useraction,selection);
  }
}
);
msrhProlong.start();
}

Fixed version (ground truth):
public void prolongAllDo(){
  MultiStepResultHelper<Void> msrhProlong=new MultiStepResultHelper<>(getActivity(),null,R.string.doing_prolong_all);
  msrhProlong.setCallback(new Callback<Void>(){
    @Override public void onSuccess(    MultiStepResult result){
      if (getActivity() == null) {
        return;
      }
      ProlongAllResult res=(ProlongAllResult)result;
      AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
      if (res.getResults() != null) {
        LayoutInflater inflater=getActivity().getLayoutInflater();
        View view=inflater.inflate(R.layout.dialog_simple_list,null,false);
        ListView lv=(ListView)view.findViewById(R.id.lvBibs);
        lv.setAdapter(new ProlongAllResultAdapter(getActivity(),res.getResults()));
switch (result.getActionIdentifier()) {
case ReservationResult.ACTION_BRANCH:
          builder.setTitle(R.string.branch);
      }
      builder.setView(view).setNeutralButton(R.string.close,new DialogInterface.OnClickListener(){
        @Override public void onClick(        DialogInterface dialog,        int id){
          adialog.cancel();
          invalidateData();
        }
      }
);
    }
 else {
      builder.setMessage(result.getMessage()).setCancelable(true).setNegativeButton(R.string.close,new DialogInterface.OnClickListener(){
        @Override public void onClick(        DialogInterface d,        int id){
          d.cancel();
        }
      }
).setOnCancelListener(new DialogInterface.OnCancelListener(){
        @Override public void onCancel(        DialogInterface d){
          if (d != null) {
            d.cancel();
          }
        }
      }
);
    }
    adialog=builder.create();
    adialog.show();
  }
  @Override public void onError(  MultiStepResult result){
    if (getActivity() == null) {
      return;
    }
    AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
    builder.setMessage(result.getMessage()).setCancelable(true).setNegativeButton(R.string.close,new DialogInterface.OnClickListener(){
      @Override public void onClick(      DialogInterface d,      int id){
        d.cancel();
      }
    }
).setOnCancelListener(new DialogInterface.OnCancelListener(){
      @Override public void onCancel(      DialogInterface d){
        if (d != null) {
          d.cancel();
        }
      }
    }
);
    AlertDialog alert=builder.create();
    alert.show();
  }
  @Override public void onUnhandledResult(  MultiStepResult result){
  }
  @Override public void onUserCancel(){
  }
  @Override public StepTask<?> newTask(  MultiStepResultHelper helper,  int useraction,  String selection,  Void argument){
    return new ProlongAllTask(helper,useraction,selection);
  }
}
);
msrhProlong.start();
}