Do not apply sapling network rules to block height 0 or 1 in ScanForWalletTransactions

src/wallet/wallet.cpp

@@ -2790,7 +2790,7 @@ int CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
             // This should never fail: we should always be able to get the tree
             // state on the path to the tip of our chain
             if (pindex->pprev) {
-                const bool sapling = true;
+                const bool sapling = pindex->GetHeight() >= 2 ? true : false;
                 if (sapling) { // NetworkUpgradeActive(pindex->pprev->GetHeight(), Params().GetConsensus(), Consensus::UPGRADE_SAPLING)) {
                     assert(pcoinsTip->GetSaplingAnchorAt(pindex->pprev->hashFinalSaplingRoot, saplingTree));
                 }