uint192 lowPaired;
uint192 highPaired = FIX_MAX;
try this.tryPairedPrice() returns (uint192 lowPaired_, uint192 highPaired_) {
    lowPaired = lowPaired_;
    highPaired = highPaired_;
} catch {}

function tryPairedPrice() public view virtual returns (uint192 lowPaired, uint192 highPaired) {
    uint192 p = chainlinkFeed.price(oracleTimeout); // {UoA/pairedTok}
    uint192 delta = p.mul(oracleError, CEIL);
    return (p - delta, p + delta);
}
aumLow += lowPaired.mul(pairedBal, FLOOR);

// Add-in high part carefully
uint192 toAdd = highPaired.safeMul(pairedBal, CEIL);
if (aumHigh + uint256(toAdd) >= FIX_MAX) {
    aumHigh = FIX_MAX;
} else {
    aumHigh += toAdd;
}
function safeMul(
    uint192 a,
    uint192 b,
    RoundingMode rounding
) internal pure returns (uint192) {
    ...
    if (a == FIX_MAX || b == FIX_MAX) return FIX_MAX;
low = aumLow.div(supply, FLOOR);
high = aumHigh.div(supply, CEIL);
