Program: 91175
Project: 91175
Buggy source:
private TransactionStatus tryCreateUnsignedColuTX(final PrepareCallback callback){
  Log.d(TAG,"String_Node_Str");
  if (_account instanceof ColuAccount) {
    final ColuAccount coluAccount=(ColuAccount)_account;
    _unsigned=null;
    _preparedCoinapult=null;
    if (CurrencyValue.isNullOrZero(_amountToSend) || _receivingAddress == null) {
      Log.d(TAG,"String_Node_Str");
      if (_amountToSend != null) {
        Log.d(TAG,"String_Node_Str" + _amountToSend);
      }
 else {
        Log.d(TAG,"String_Node_Str");
      }
      if (_receivingAddress != null) {
        Log.d(TAG,"String_Node_Str" + _receivingAddress.toString());
      }
      return TransactionStatus.MissingArguments;
    }
    if (!_amountToSend.getCurrency().equals(coluAccount.getColuAsset().name)) {
      Log.d(TAG,"String_Node_Str" + _amountToSend.getCurrency() + "String_Node_Str"+ coluAccount.getColuAsset().name);
      return TransactionStatus.MissingArguments;
    }
    ExactCurrencyValue nativeAmount=ExactCurrencyValue.from(_amountToSend.getValue(),_amountToSend.getCurrency());
    Log.d(TAG,"String_Node_Str");
    final ColuManager coluManager=_mbwManager.getColuManager();
    final long feePerKb=feePerKbValue;
    ColuTransactionData coluTransactionData=new ColuTransactionData(_receivingAddress,nativeAmount,coluAccount,feePerKb);
    if (callback != null) {
      new AsyncTask<ColuTransactionData,Void,ColuBroadcastTxHex.Json>(){
        @Override protected ColuBroadcastTxHex.Json doInBackground(        ColuTransactionData... params){
          if (!checkFee(true)) {
            if (coluAccount.getLinkedAccount() == feeColuAccount) {
              return createEmptyColuBroadcastJson();
            }
            List<WalletAccount.Receiver> receivers=new ArrayList<WalletAccount.Receiver>();
            long txFee=_mbwManager.getColuManager().getColuTransactionFee(feePerKb);
            long fundingAmountToSend=txFee + getAmountForColuTxOutputs();
            if (txFee < TransactionUtils.MINIMUM_OUTPUT_VALUE)             fundingAmountToSend=TransactionUtils.MINIMUM_OUTPUT_VALUE;
            WalletAccount.Receiver coluReceiver=new WalletAccount.Receiver(_account.getReceivingAddress().get(),fundingAmountToSend);
            receivers.add(coluReceiver);
            try {
              UnsignedTransaction fundingTransaction=feeColuAccount.createUnsignedTransaction(receivers,feePerKb);
              Transaction signedFundingTransaction=feeColuAccount.signTransaction(fundingTransaction,AesKeyCipher.defaultKeyCipher());
              WalletAccount.BroadcastResult broadcastResult=feeColuAccount.broadcastTransaction(signedFundingTransaction);
              if (broadcastResult != WalletAccount.BroadcastResult.SUCCESS) {
                return createEmptyColuBroadcastJson();
              }
              coluManager.broadcastTransaction(signedFundingTransaction);
            }
 catch (            OutputTooSmallException|InsufficientFundsException|UnableToBuildTransactionException|KeyCipher.InvalidKeyCipher ex) {
              return createEmptyColuBroadcastJson();
            }
            for (int attemtps=0; attemtps < 10; attemtps++) {
              if (checkFee(true)) {
                Log.d(TAG,"String_Node_Str");
                break;
              }
              try {
                Thread.sleep(ColuManager.TIME_INTERVAL_BETWEEN_BALANCE_FUNDING_CHECKS);
              }
 catch (              InterruptedException e) {
                e.printStackTrace();
              }
            }
          }
          return coluManager.prepareColuTx(params[0].getReceivingAddress(),params[0].getNativeAmount(),params[0].getColuAccount(),(int)params[0].getFeePerKb());
        }
        @Override protected void onPostExecute(        ColuBroadcastTxHex.Json preparedTransaction){
          super.onPostExecute(preparedTransaction);
          Log.d(TAG,"String_Node_Str");
          if (preparedTransaction != null && !preparedTransaction.txHex.isEmpty()) {
            Log.d(TAG,"String_Node_Str" + preparedTransaction.txHex);
            _preparedColuTx=preparedTransaction;
            if (callback != null) {
              callback.success();
            }
            Toast.makeText(SendMainActivity.this,R.string.colu_succeeded_to_prepare,Toast.LENGTH_SHORT).show();
          }
 else {
            if (callback != null) {
              callback.fail();
            }
            Toast.makeText(SendMainActivity.this,getString(R.string.colu_failed_to_prepare),Toast.LENGTH_SHORT).show();
            updateUi();
          }
        }
      }
.executeOnExecutor(AsyncTask.SERIAL_EXECUTOR,coluTransactionData);
    }
    return TransactionStatus.OK;
  }
  Log.e(TAG,"String_Node_Str");
  return TransactionStatus.MissingArguments;
}

Fixed version (ground truth):
private TransactionStatus tryCreateUnsignedColuTX(final PrepareCallback callback){
  Log.d(TAG,"String_Node_Str");
  if (_account instanceof ColuAccount) {
    final ColuAccount coluAccount=(ColuAccount)_account;
    _unsigned=null;
    _preparedCoinapult=null;
    if (CurrencyValue.isNullOrZero(_amountToSend) || _receivingAddress == null) {
      Log.d(TAG,"String_Node_Str");
      if (_amountToSend != null) {
        Log.d(TAG,"String_Node_Str" + _amountToSend);
      }
 else {
        Log.d(TAG,"String_Node_Str");
      }
      if (_receivingAddress != null) {
        Log.d(TAG,"String_Node_Str" + _receivingAddress.toString());
      }
      return TransactionStatus.MissingArguments;
    }
    if (!_amountToSend.getCurrency().equals(coluAccount.getColuAsset().name)) {
      Log.d(TAG,"String_Node_Str" + _amountToSend.getCurrency() + "String_Node_Str"+ coluAccount.getColuAsset().name);
      return TransactionStatus.MissingArguments;
    }
    ExactCurrencyValue nativeAmount=ExactCurrencyValue.from(_amountToSend.getValue(),_amountToSend.getCurrency());
    Log.d(TAG,"String_Node_Str");
    final ColuManager coluManager=_mbwManager.getColuManager();
    final long feePerKb=feePerKbValue;
    ColuTransactionData coluTransactionData=new ColuTransactionData(_receivingAddress,nativeAmount,coluAccount,feePerKb);
    if (callback != null) {
      new AsyncTask<ColuTransactionData,Void,ColuBroadcastTxHex.Json>(){
        @Override protected ColuBroadcastTxHex.Json doInBackground(        ColuTransactionData... params){
          if (!checkFee(true)) {
            if (coluAccount.getLinkedAccount() == feeColuAccount) {
              return createEmptyColuBroadcastJson();
            }
            List<WalletAccount.Receiver> receivers=new ArrayList<WalletAccount.Receiver>();
            long txFee=_mbwManager.getColuManager().getColuTransactionFee(feePerKb);
            long fundingAmountToSend=txFee + getAmountForColuTxOutputs();
            if (txFee < TransactionUtils.MINIMUM_OUTPUT_VALUE)             fundingAmountToSend=TransactionUtils.MINIMUM_OUTPUT_VALUE;
            WalletAccount.Receiver coluReceiver=new WalletAccount.Receiver(_account.getReceivingAddress().get(),fundingAmountToSend);
            receivers.add(coluReceiver);
            try {
              UnsignedTransaction fundingTransaction=feeColuAccount.createUnsignedTransaction(receivers,feePerKb);
              Transaction signedFundingTransaction=feeColuAccount.signTransaction(fundingTransaction,AesKeyCipher.defaultKeyCipher());
              WalletAccount.BroadcastResult broadcastResult=feeColuAccount.broadcastTransaction(signedFundingTransaction);
              if (broadcastResult != WalletAccount.BroadcastResult.SUCCESS) {
                return createEmptyColuBroadcastJson();
              }
              coluManager.broadcastTransaction(signedFundingTransaction);
            }
 catch (            OutputTooSmallException|InsufficientFundsException|UnableToBuildTransactionException|KeyCipher.InvalidKeyCipher ex) {
              return createEmptyColuBroadcastJson();
            }
            for (int attemtps=0; attemtps < 10; attemtps++) {
              if (checkFee(true)) {
                Log.d(TAG,"String_Node_Str");
                break;
              }
              try {
                Thread.sleep(ColuManager.TIME_INTERVAL_BETWEEN_BALANCE_FUNDING_CHECKS);
              }
 catch (              InterruptedException e) {
                e.printStackTrace();
              }
            }
          }
          return coluManager.prepareColuTx(params[0].getReceivingAddress(),params[0].getNativeAmount(),params[0].getColuAccount(),(int)params[0].getFeePerKb());
        }
        @Override protected void onPostExecute(        ColuBroadcastTxHex.Json preparedTransaction){
          super.onPostExecute(preparedTransaction);
          Log.d(TAG,"String_Node_Str");
          if (preparedTransaction != null && !preparedTransaction.txHex.isEmpty()) {
            Log.d(TAG,"String_Node_Str" + preparedTransaction.txHex);
            _preparedColuTx=preparedTransaction;
            if (callback != null) {
              callback.success();
            }
          }
 else {
            if (callback != null) {
              callback.fail();
            }
            Toast.makeText(SendMainActivity.this,getString(R.string.colu_failed_to_prepare),Toast.LENGTH_SHORT).show();
            updateUi();
          }
        }
      }
.executeOnExecutor(AsyncTask.SERIAL_EXECUTOR,coluTransactionData);
    }
    return TransactionStatus.OK;
  }
  Log.e(TAG,"String_Node_Str");
  return TransactionStatus.MissingArguments;
}