diff --git a/src/init.cpp b/src/init.cpp
index e88055bd..f6b2c91b 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -119,7 +119,7 @@ void Shutdown()
     }
     bitdb.Flush(true);
     boost::filesystem::remove(GetPidFile());
-    UnregisterWallet(pwalletMain);
+    UnregisterAllWallets();
     delete pwalletMain;
 }
 
diff --git a/src/main.cpp b/src/main.cpp
index 5cde2a43..b8b9bc35 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -99,9 +99,16 @@ void UnregisterWallet(CWallet* pwalletIn)
     }
 }
 
+void UnregisterAllWallets()
+{
+    LOCK(cs_setpwalletRegistered);
+    setpwalletRegistered.clear();
+}
+
 // get the wallet transaction with the given hash (if it exists)
 bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
 {
+    LOCK(cs_setpwalletRegistered);
     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
         if (pwallet->GetTransaction(hashTx,wtx))
             return true;
@@ -111,6 +118,7 @@ bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
 // erases transaction with the given hash from all wallets
 void static EraseFromWallets(uint256 hash)
 {
+    LOCK(cs_setpwalletRegistered);
     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
         pwallet->EraseFromWallet(hash);
 }
@@ -118,6 +126,7 @@ void static EraseFromWallets(uint256 hash)
 // make sure all wallets know about the given transaction, in the given block
 void SyncWithWallets(const uint256 &hash, const CTransaction& tx, const CBlock* pblock, bool fUpdate)
 {
+    LOCK(cs_setpwalletRegistered);
     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
         pwallet->AddToWalletIfInvolvingMe(hash, tx, pblock, fUpdate);
 }
@@ -125,6 +134,7 @@ void SyncWithWallets(const uint256 &hash, const CTransaction& tx, const CBlock*
 // notify wallets about a new best chain
 void static SetBestChain(const CBlockLocator& loc)
 {
+    LOCK(cs_setpwalletRegistered);
     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
         pwallet->SetBestChain(loc);
 }
@@ -132,6 +142,7 @@ void static SetBestChain(const CBlockLocator& loc)
 // notify wallets about an updated transaction
 void static UpdatedTransaction(const uint256& hashTx)
 {
+    LOCK(cs_setpwalletRegistered);
     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
         pwallet->UpdatedTransaction(hashTx);
 }
@@ -139,6 +150,7 @@ void static UpdatedTransaction(const uint256& hashTx)
 // dump all wallets
 void static PrintWallets(const CBlock& block)
 {
+    LOCK(cs_setpwalletRegistered);
     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
         pwallet->PrintWallet(block);
 }
@@ -146,6 +158,7 @@ void static PrintWallets(const CBlock& block)
 // notify wallets about an incoming inventory (for request counts)
 void static Inventory(const uint256& hash)
 {
+    LOCK(cs_setpwalletRegistered);
     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
         pwallet->Inventory(hash);
 }
@@ -153,6 +166,7 @@ void static Inventory(const uint256& hash)
 // ask wallets to resend their transactions
 void static ResendWalletTransactions()
 {
+    LOCK(cs_setpwalletRegistered);
     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
         pwallet->ResendWalletTransactions();
 }
diff --git a/src/main.h b/src/main.h
index 9e0235fa..7b77b0e3 100644
--- a/src/main.h
+++ b/src/main.h
@@ -119,6 +119,8 @@ struct CBlockTemplate;
 void RegisterWallet(CWallet* pwalletIn);
 /** Unregister a wallet from core */
 void UnregisterWallet(CWallet* pwalletIn);
+/** Unregister all wallets from core */
+void UnregisterAllWallets();
 /** Push an updated transaction to all registered wallets */
 void SyncWithWallets(const uint256 &hash, const CTransaction& tx, const CBlock* pblock = NULL, bool fUpdate = false);