diff --git a/src/wallet/test/accounting_tests.cpp b/src/wallet/test/accounting_tests.cpp
index 7b20bd7b0..aae328d81 100644
--- a/src/wallet/test/accounting_tests.cpp
+++ b/src/wallet/test/accounting_tests.cpp
@@ -29,7 +29,7 @@ GetResults(CWallet& wallet, std::map<CAmount, CAccountingEntry>& results)
 BOOST_AUTO_TEST_CASE(acc_orderupgrade)
 {
     std::vector<CWalletTx*> vpwtx;
-    CWalletTx wtx;
+    CWalletTx wtx(nullptr /* pwallet */, MakeTransactionRef());
     CAccountingEntry ae;
     std::map<CAmount, CAccountingEntry> results;
 
@@ -44,7 +44,7 @@ BOOST_AUTO_TEST_CASE(acc_orderupgrade)
 
     wtx.mapValue["comment"] = "z";
     m_wallet.AddToWallet(wtx);
-    vpwtx.push_back(&m_wallet.mapWallet[wtx.GetHash()]);
+    vpwtx.push_back(&m_wallet.mapWallet.at(wtx.GetHash()));
     vpwtx[0]->nTimeReceived = (unsigned int)1333333335;
     vpwtx[0]->nOrderPos = -1;
 
@@ -86,7 +86,7 @@ BOOST_AUTO_TEST_CASE(acc_orderupgrade)
         wtx.SetTx(MakeTransactionRef(std::move(tx)));
     }
     m_wallet.AddToWallet(wtx);
-    vpwtx.push_back(&m_wallet.mapWallet[wtx.GetHash()]);
+    vpwtx.push_back(&m_wallet.mapWallet.at(wtx.GetHash()));
     vpwtx[1]->nTimeReceived = (unsigned int)1333333336;
 
     wtx.mapValue["comment"] = "x";
@@ -96,7 +96,7 @@ BOOST_AUTO_TEST_CASE(acc_orderupgrade)
         wtx.SetTx(MakeTransactionRef(std::move(tx)));
     }
     m_wallet.AddToWallet(wtx);
-    vpwtx.push_back(&m_wallet.mapWallet[wtx.GetHash()]);
+    vpwtx.push_back(&m_wallet.mapWallet.at(wtx.GetHash()));
     vpwtx[2]->nTimeReceived = (unsigned int)1333333329;
     vpwtx[2]->nOrderPos = -1;
 
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 8e47b21d6..5ab2f5717 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -531,7 +531,7 @@ void CWallet::SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator> ran
     int nMinOrderPos = std::numeric_limits<int>::max();
     const CWalletTx* copyFrom = nullptr;
     for (TxSpends::iterator it = range.first; it != range.second; ++it) {
-        const CWalletTx* wtx = &mapWallet[it->second];
+        const CWalletTx* wtx = &mapWallet.at(it->second);
         if (wtx->nOrderPos < nMinOrderPos) {
             nMinOrderPos = wtx->nOrderPos;;
             copyFrom = wtx;
@@ -544,7 +544,7 @@ void CWallet::SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator> ran
     for (TxSpends::iterator it = range.first; it != range.second; ++it)
     {
         const uint256& hash = it->second;
-        CWalletTx* copyTo = &mapWallet[hash];
+        CWalletTx* copyTo = &mapWallet.at(hash);
         if (copyFrom == copyTo) continue;
         assert(copyFrom && "Oldest wallet transaction in range assumed to have been found.");
         if (!copyFrom->IsEquivalentTo(*copyTo)) continue;
@@ -3081,7 +3081,7 @@ bool CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::ve
             // Notify that old coins are spent
             for (const CTxIn& txin : wtxNew.tx->vin)
             {
-                CWalletTx &coin = mapWallet[txin.prevout.hash];
+                CWalletTx &coin = mapWallet.at(txin.prevout.hash);
                 coin.BindWallet(this);
                 NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED);
             }
@@ -3092,7 +3092,7 @@ bool CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::ve
 
         // Get the inserted-CWalletTx from mapWallet so that the
         // fInMempool flag is cached properly
-        CWalletTx& wtx = mapWallet[wtxNew.GetHash()];
+        CWalletTx& wtx = mapWallet.at(wtxNew.GetHash());
 
         if (fBroadcastTransactions)
         {
@@ -3548,7 +3548,7 @@ std::set< std::set<CTxDestination> > CWallet::GetAddressGroupings()
                 CTxDestination address;
                 if(!IsMine(txin)) /* If this input isn't mine, ignore it */
                     continue;
-                if(!ExtractDestination(mapWallet[txin.prevout.hash].tx->vout[txin.prevout.n].scriptPubKey, address))
+                if(!ExtractDestination(mapWallet.at(txin.prevout.hash).tx->vout[txin.prevout.n].scriptPubKey, address))
                     continue;
                 grouping.insert(address);
                 any_mine = true;
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index cdb0def2e..f68d40f09 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -348,11 +348,6 @@ public:
     mutable CAmount nAvailableWatchCreditCached;
     mutable CAmount nChangeCached;
 
-    CWalletTx()
-    {
-        Init(nullptr);
-    }
-
     CWalletTx(const CWallet* pwalletIn, CTransactionRef arg) : CMerkleTx(std::move(arg))
     {
         Init(pwalletIn);
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 0b0880a2b..7f5f3b84b 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -265,7 +265,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
         {
             uint256 hash;
             ssKey >> hash;
-            CWalletTx wtx;
+            CWalletTx wtx(nullptr /* pwallet */, MakeTransactionRef());
             ssValue >> wtx;
             CValidationState state;
             if (!(CheckTransaction(*wtx.tx, state) && (wtx.GetHash() == hash) && state.IsValid()))
@@ -603,7 +603,7 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
         pwallet->UpdateTimeFirstKey(1);
 
     for (uint256 hash : wss.vWalletUpgrade)
-        WriteTx(pwallet->mapWallet[hash]);
+        WriteTx(pwallet->mapWallet.at(hash));
 
     // Rewrite encrypted wallets of versions 0.4.0 and 0.5.0rc:
     if (wss.fIsEncrypted && (wss.nFileVersion == 40000 || wss.nFileVersion == 50000))
@@ -664,7 +664,7 @@ DBErrors CWalletDB::FindWalletTx(std::vector<uint256>& vTxHash, std::vector<CWal
                 uint256 hash;
                 ssKey >> hash;
 
-                CWalletTx wtx;
+                CWalletTx wtx(nullptr /* pwallet */, MakeTransactionRef());
                 ssValue >> wtx;
 
                 vTxHash.push_back(hash);