[Qt] add missing lock in walletmodel

src/qt/walletmodel.cpp

@@ -488,6 +488,7 @@ bool WalletModel::getPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const
 // returns a list of COutputs from COutPoints
 void WalletModel::getOutputs(const std::vector<COutPoint>& vOutpoints, std::vector<COutput>& vOutputs)
 {
+    LOCK(wallet->cs_wallet);
     BOOST_FOREACH(const COutPoint& outpoint, vOutpoints)
     {
         if (!wallet->mapWallet.count(outpoint.hash)) continue;