} else {
    /// @notice Borrowers clears interest
    _checkSignature(_renegotiationOffer.lender, _renegotiationOffer.hash(), _renegotiationOfferSignature);
    netNewLender -= totalAccruedInterest; // @audit possible overflow when netNewLender < totalAccruedInterest
    totalAccruedInterest = 0;
}
netNewLender = principalAmount - fee = 2 eth (assume fee = 0)
totalAccruedInterest = 2.1 eth
netNewLender -= totalAccruedInterest (revert)
