Program: 91219
Project: 91219
Buggy source:
@Override public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
  View root=Preconditions.checkNotNull(inflater.inflate(R.layout.glidera_buy,container,false));
  etBuyFiat=(EditText)root.findViewById(R.id.etBuyFiat);
  etBuyBtc=(EditText)root.findViewById(R.id.etBuyBtc);
  tvSubtotal=(TextView)root.findViewById(R.id.tvFiatAmount);
  tvBtcAmount=(TextView)root.findViewById(R.id.tvBtcAmount);
  tvFeeAmount=(TextView)root.findViewById(R.id.tvFeeAmount);
  tvTotalAmount=(TextView)root.findViewById(R.id.tvTotalAmount);
  tvPrice=(TextView)root.findViewById(R.id.tvPrice);
  Button buttonBuyBitcoin=(Button)root.findViewById(R.id.buttonBuyBitcoin);
  final TextView tvBuyFiatDescription=(TextView)root.findViewById(R.id.tvBuyFiatDescription);
  final BuyPriceRequest buyPriceRequest=new BuyPriceRequest(BigDecimal.ONE,null);
  glideraService.buyPrice(buyPriceRequest).subscribe(new Observer<BuyPriceResponse>(){
    @Override public void onCompleted(){
    }
    @Override public void onError(    Throwable e){
    }
    @Override public void onNext(    BuyPriceResponse buyPriceResponse){
      tvBuyFiatDescription.setText(buyPriceResponse.getCurrency());
      tvPrice.setText(GlideraUtils.formatFiatForDisplay(buyPriceResponse.getPrice()));
      currencyIso=buyPriceResponse.getCurrency();
    }
  }
);
  glideraService.transactionLimits().subscribe(new Observer<TransactionLimitsResponse>(){
    @Override public void onCompleted(){
    }
    @Override public void onError(    Throwable e){
    }
    @Override public void onNext(    TransactionLimitsResponse transactionLimitsResponse){
      _transactionLimitsResponse=transactionLimitsResponse;
    }
  }
);
  buttonBuyBitcoin.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      String qty=etBuyBtc.getText().toString();
      if (qty.isEmpty()) {
        String error="String_Node_Str" + GlideraUtils.formatBtcForDisplay(BigDecimal.ZERO);
        setError(BuyMode.BTC,error);
        return;
      }
      BigDecimal fiat=new BigDecimal(etBuyFiat.getText().toString());
      if (fiat.compareTo(_transactionLimitsResponse.getDailyBuyRemaining()) > 0) {
        String error="String_Node_Str" + GlideraUtils.formatFiatForDisplay(_transactionLimitsResponse.getDailyBuyRemaining());
        setError(BuyMode.FIAT,error);
        return;
      }
      glideraService.getTwoFactor().subscribe(new Observer<TwoFactorResponse>(){
        @Override public void onCompleted(){
        }
        @Override public void onError(        Throwable e){
        }
        @Override public void onNext(        TwoFactorResponse twoFactorResponse){
          DialogFragment newFragment=GlideraBuy2faDialog.newInstance(_buyMode,_btc,_fiat,twoFactorResponse.getMode());
          newFragment.show(getFragmentManager(),"String_Node_Str");
        }
      }
);
    }
  }
);
  return root;
}

Fixed version (ground truth):
@Override public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
  View root=Preconditions.checkNotNull(inflater.inflate(R.layout.glidera_buy,container,false));
  etBuyFiat=(EditText)root.findViewById(R.id.etBuyFiat);
  etBuyBtc=(EditText)root.findViewById(R.id.etBuyBtc);
  tvSubtotal=(TextView)root.findViewById(R.id.tvFiatAmount);
  tvBtcAmount=(TextView)root.findViewById(R.id.tvBtcAmount);
  tvFeeAmount=(TextView)root.findViewById(R.id.tvFeeAmount);
  tvTotalAmount=(TextView)root.findViewById(R.id.tvTotalAmount);
  tvPrice=(TextView)root.findViewById(R.id.tvPrice);
  tvBuyFiatDescription=(TextView)root.findViewById(R.id.tvBuyFiatDescription);
  Button buttonBuyBitcoin=(Button)root.findViewById(R.id.buttonBuyBitcoin);
  final BuyPriceRequest buyPriceRequest=new BuyPriceRequest(BigDecimal.ONE,null);
  glideraService.buyPrice(buyPriceRequest).subscribe(new Observer<BuyPriceResponse>(){
    @Override public void onCompleted(){
    }
    @Override public void onError(    Throwable e){
    }
    @Override public void onNext(    BuyPriceResponse buyPriceResponse){
      tvBuyFiatDescription.setText(buyPriceResponse.getCurrency());
      tvPrice.setText(GlideraUtils.formatFiatForDisplay(buyPriceResponse.getPrice()));
      currencyIso=buyPriceResponse.getCurrency();
    }
  }
);
  glideraService.transactionLimits().subscribe(new Observer<TransactionLimitsResponse>(){
    @Override public void onCompleted(){
    }
    @Override public void onError(    Throwable e){
    }
    @Override public void onNext(    TransactionLimitsResponse transactionLimitsResponse){
      _transactionLimitsResponse=transactionLimitsResponse;
    }
  }
);
  buttonBuyBitcoin.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      String qty=etBuyBtc.getText().toString();
      if (qty.isEmpty()) {
        String error="String_Node_Str" + GlideraUtils.formatBtcForDisplay(BigDecimal.ZERO);
        setError(BuyMode.BTC,error);
        return;
      }
      BigDecimal fiat=new BigDecimal(etBuyFiat.getText().toString());
      if (fiat.compareTo(_transactionLimitsResponse.getDailyBuyRemaining()) > 0) {
        String error="String_Node_Str" + GlideraUtils.formatFiatForDisplay(_transactionLimitsResponse.getDailyBuyRemaining());
        setError(BuyMode.FIAT,error);
        return;
      }
      glideraService.getTwoFactor().subscribe(new Observer<TwoFactorResponse>(){
        @Override public void onCompleted(){
        }
        @Override public void onError(        Throwable e){
        }
        @Override public void onNext(        TwoFactorResponse twoFactorResponse){
          DialogFragment newFragment=GlideraBuy2faDialog.newInstance(_buyMode,_btc,_fiat,twoFactorResponse.getMode());
          newFragment.show(getFragmentManager(),"String_Node_Str");
        }
      }
);
    }
  }
);
  return root;
}