diff --git a/src/cc/dice.cpp b/src/cc/dice.cpp
index a434a40ea..fedb8a25c 100644
--- a/src/cc/dice.cpp
+++ b/src/cc/dice.cpp
@@ -241,21 +241,24 @@ int32_t dicefinish_utxosget(int32_t &total,struct dicefinish_utxo *utxos,int32_t
     total = 0;
     std::vector<std::pair<CAddressUnspentKey, CAddressUnspentValue> > unspentOutputs;
     SetCCunspents(unspentOutputs,coinaddr);
-    for (std::vector<std::pair<CAddressUnspentKey, CAddressUnspentValue> >::const_iterator it=unspentOutputs.begin(); it!=unspentOutputs.end(); it++)
     {
-        if ( myIsutxo_spentinmempool(it->first.txhash,(int32_t)it->first.index) == 0 )
+        LOCK(mempool.cs);
+        for (std::vector<std::pair<CAddressUnspentKey, CAddressUnspentValue> >::const_iterator it=unspentOutputs.begin(); it!=unspentOutputs.end(); it++)
         {
-            if ( it->second.satoshis < threshold || it->second.satoshis > 10*threshold )
-                continue;
-            total++;
-            if ( n < max )
+            if ( myIsutxo_spentinmempool(it->first.txhash,(int32_t)it->first.index) == 0 )
             {
-                if ( utxos != 0 )
+                if ( it->second.satoshis < threshold || it->second.satoshis > 10*threshold )
+                    continue;
+                total++;
+                if ( n < max )
                 {
-                    utxos[n].txid = it->first.txhash;
-                    utxos[n].vout = (int32_t)it->first.index;
+                    if ( utxos != 0 )
+                    {
+                        utxos[n].txid = it->first.txhash;
+                        utxos[n].vout = (int32_t)it->first.index;
+                    }
+                    n++;
                 }
-                n++;
             }
         }
     }
@@ -284,6 +287,7 @@ int32_t dice_betspent(char *debugstr,uint256 bettxid)
     }
     else*/
     {
+        LOCK(mempool.cs);
         if ( myIsutxo_spentinmempool(bettxid,0) != 0 || myIsutxo_spentinmempool(bettxid,1) != 0 )
         {
             fprintf(stderr,"%s bettxid.%s already spent in mempool\n",debugstr,bettxid.GetHex().c_str());
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 4b5ef8a1f..4aaaef33c 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -6188,6 +6188,7 @@ UniValue dicefinish(const UniValue& params, bool fHelp)
     if ( ensure_CCrequirements() < 0 )
         throw runtime_error("to use CC contracts, you need to launch daemon with valid -pubkey= for an address in your wallet\n");
     const CKeyStore& keystore = *pwalletMain;
+    LOCK(mempool.cs);
     LOCK2(cs_main, pwalletMain->cs_wallet);
     name = (char *)params[0].get_str().c_str();
     if (!VALID_PLAN_NAME(name)) {
@@ -6223,6 +6224,7 @@ UniValue dicestatus(const UniValue& params, bool fHelp)
     if ( ensure_CCrequirements() < 0 )
         throw runtime_error("to use CC contracts, you need to launch daemon with valid -pubkey= for an address in your wallet\n");
     const CKeyStore& keystore = *pwalletMain;
+    LOCK(mempool.cs);
     LOCK2(cs_main, pwalletMain->cs_wallet);
     name = (char *)params[0].get_str().c_str();
     if (!VALID_PLAN_NAME(name)) {