function _computeYield(
		address _user,
		uint256 _userYieldIBT,
		uint256 _oldIBTRate,
		uint256 _ibtRate,
		uint256 _oldPTRate,
		uint256 _ptRate,
		address _yt
) external view returns (uint256) {
      yieldInAssetRay = yieldInAssetRay.fromRay(
          IERC4626(IPrincipalToken(IYieldToken(_yt).getPT()).underlying()).decimals()
      ) < SAFETY_BOUND
          ? 0
          : yieldInAssetRay;
      }
function _computeYield(
		address _user,
		uint256 _userYieldIBT,
		uint256 _oldIBTRate,
		uint256 _ibtRate,
		uint256 _oldPTRate,
		uint256 _ptRate,
		address _yt
) external view returns (uint256) {
      yieldInAssetRay = yieldInAssetRay.fromRay(
-          IERC4626(IPrincipalToken(IYieldToken(_yt).getPT()).underlying()).decimals()
+          IERC20Metadata(IPrincipalToken(IYieldToken(_yt).getPT()).underlying()).decimals()
      ) < SAFETY_BOUND
          ? 0
          : yieldInAssetRay;
      }
