313        // --- CASE 5: Using Chainlink, Fallback is untrusted ---
314        if (status == Status.usingChainlinkFallbackUntrusted) {
    (...)
340            if (_chainlinkPriceChangeAboveMax(chainlinkResponse, prevChainlinkResponse)) {
341                _changeStatus(Status.bothOraclesUntrusted);
342                return lastGoodPrice;
343            }
219        // --- CASE 3: Both oracles were untrusted at the last price fetch ---
220        if (status == Status.bothOraclesUntrusted) {
221            /*
222             * If there's no fallback, only use Chainlink
223             */
224            if (address(fallbackCaller) == address(0)) {
225                // If CL has resumed working
226                if (
227                    !_chainlinkIsBroken(chainlinkResponse, prevChainlinkResponse) &&
228                    !_chainlinkIsFrozen(chainlinkResponse)
229                ) {
230                    _changeStatus(Status.usingChainlinkFallbackUntrusted);
231                    return _storeChainlinkPrice(chainlinkResponse.answer);
232                }
233            }
            // If Chainlink price has changed by > 50% between two consecutive rounds, compare it to Fallback's price
-           if (_chainlinkPriceChangeAboveMax(chainlinkResponse, prevChainlinkResponse)) {
+           if (_chainlinkPriceChangeAboveMax(chainlinkResponse, prevChainlinkResponse) && address(fallbackCaller) != address(0)) {
                // If Fallback is broken, both oracles are untrusted, and return last good price
                // We don't trust CL for now given this large price differential
                if (_fallbackIsBroken(fallbackResponse)) {
                    _changeStatus(Status.bothOraclesUntrusted);
                    return lastGoodPrice;
                }

    (...)

            // If Chainlink is live but deviated >50% from it's previous price and Fallback is still untrusted, switch
            // to bothOraclesUntrusted and return last good price
-           if (_chainlinkPriceChangeAboveMax(chainlinkResponse, prevChainlinkResponse)) {
+           if (_chainlinkPriceChangeAboveMax(chainlinkResponse, prevChainlinkResponse) && address(fallbackCaller) != address(0)) {
                _changeStatus(Status.bothOraclesUntrusted);
                return lastGoodPrice;
            }
