    // transfer to treasury
    if (_vaultFee > 0) {
      uint256 treasuryAmount = _processTreasury(_asset, yieldAmount);
      yieldAmount = yieldAmount.sub(treasuryAmount);
    }

    // transfer to yieldManager
    address yieldManager = _addressesProvider.getAddress('YIELD_MANAGER');
    TransferHelper.safeTransfer(_asset, yieldManager, yieldAmount);
  function _processTreasury(address _asset, uint256 _yieldAmount) internal returns (uint256) {
    uint256 treasuryAmount = _yieldAmount.percentMul(_vaultFee);
    IERC20(_asset).safeTransfer(_treasuryAddress, treasuryAmount);
    return treasuryAmount;
  }
+	if (yieldAmount > 0) {
	    // transfer to treasury
	    if (_vaultFee > 0) {
	      uint256 treasuryAmount = _processTreasury(_asset, yieldAmount);
	      yieldAmount = yieldAmount.sub(treasuryAmount);
	    }

	    // transfer to yieldManager
	    address yieldManager = _addressesProvider.getAddress('YIELD_MANAGER');
	    TransferHelper.safeTransfer(_asset, yieldManager, yieldAmount);
+  }
