    function approveUSDPrice(
        uint256 _price
    )
        external
        onlyOneOfRoles(
            [
                Role.PriceFeed_1,
                Role.PriceFeed_2,
                Role.PriceFeed_3,
                Role.PriceFeed_4,
                Role.PriceFeed_5
            ]
        )
    {
        if (usdUpdateProposal.proposer == address(0)) revert NoProposalError();
        if (usdUpdateProposal.proposer == msg.sender)
            revert ProposerCannotApproveError();
        if (usdUpdateProposal.approvals[msg.sender] == _usdProposalId)
            revert ProposalAlreadyApprovedError();
+       if (usdUpdateProposal.disapprovals[msg.sender] == _usdProposalId)
+           revert ProposalAlreadyDisapprovedError();
        if (usdUpdateProposal.proposedPrice != _price)
            revert ProposalPriceNotMatchedError();

        usdUpdateProposal.approvals[msg.sender] = _usdProposalId;
        usdUpdateProposal.approvalsCount++;

        if (usdUpdateProposal.approvalsCount >= APPROVE_THRESHOLD) {
            _execUSDPriceUpdate();
        }

        emit ApprovedUSDPrice(msg.sender);
    }
