diff --git a/src/wallet/wallettool.cpp b/src/wallet/wallettool.cpp
index f46215dc14..a3bcbce172 100644
--- a/src/wallet/wallettool.cpp
+++ b/src/wallet/wallettool.cpp
@@ -1,161 +1,161 @@
 // Copyright (c) 2016-2018 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <base58.h>
 #include <chainparams.h>
 #include <fs.h>
 #include <interfaces/chain.h>
 #include <util/system.h>
 #include <wallet/wallet.h>
 #include <wallet/walletutil.h>
 
 #include <stdexcept>
 
 namespace WalletTool {
 
 // The standard wallet deleter function blocks on the validation interface
 // queue, which doesn't exist for the bitcoin-wallet. Define our own
 // deleter here.
 static void WalletToolReleaseWallet(CWallet *wallet) {
     wallet->WalletLogPrintf("Releasing wallet\n");
     wallet->Flush();
     delete wallet;
 }
 
 static std::shared_ptr<CWallet> CreateWallet(const std::string &name,
                                              const fs::path &path) {
     if (fs::exists(path)) {
         fprintf(stderr, "Error: File exists already\n");
         return nullptr;
     }
     // dummy chain interface
     auto chain = interfaces::MakeChain();
     std::shared_ptr<CWallet> wallet_instance(
         new CWallet(Params(), *chain, WalletLocation(name),
                     WalletDatabase::Create(path)),
         WalletToolReleaseWallet);
     bool first_run = true;
     DBErrors load_wallet_ret = wallet_instance->LoadWallet(first_run);
     if (load_wallet_ret != DBErrors::LOAD_OK) {
         fprintf(stderr, "Error creating %s", name.c_str());
         return nullptr;
     }
 
     wallet_instance->SetMinVersion(FEATURE_HD_SPLIT);
 
     // generate a new HD seed
     CPubKey seed = wallet_instance->GenerateNewSeed();
     wallet_instance->SetHDSeed(seed);
 
     fprintf(stdout, "Topping up keypool...\n");
     wallet_instance->TopUpKeyPool();
     return wallet_instance;
 }
 
 static std::shared_ptr<CWallet> LoadWallet(const std::string &name,
                                            const fs::path &path) {
     if (!fs::exists(path)) {
         fprintf(stderr, "Error: Wallet files does not exist\n");
         return nullptr;
     }
 
     // dummy chain interface
     auto chain = interfaces::MakeChain();
     std::shared_ptr<CWallet> wallet_instance(
         new CWallet(Params(), *chain, WalletLocation(name),
                     WalletDatabase::Create(path)),
         WalletToolReleaseWallet);
     DBErrors load_wallet_ret;
     try {
         bool first_run;
         load_wallet_ret = wallet_instance->LoadWallet(first_run);
-    } catch (const std::runtime_error) {
+    } catch (const std::runtime_error &) {
         fprintf(stderr,
                 "Error loading %s. Is wallet being used by another process?\n",
                 name.c_str());
         return nullptr;
     }
 
     if (load_wallet_ret != DBErrors::LOAD_OK) {
         wallet_instance = nullptr;
         if (load_wallet_ret == DBErrors::CORRUPT) {
             fprintf(stderr, "Error loading %s: Wallet corrupted", name.c_str());
             return nullptr;
         } else if (load_wallet_ret == DBErrors::NONCRITICAL_ERROR) {
             fprintf(stderr,
                     "Error reading %s! All keys read correctly, but "
                     "transaction data"
                     " or address book entries might be missing or incorrect.",
                     name.c_str());
         } else if (load_wallet_ret == DBErrors::TOO_NEW) {
             fprintf(stderr,
                     "Error loading %s: Wallet requires newer version of %s",
                     name.c_str(), PACKAGE_NAME);
             return nullptr;
         } else if (load_wallet_ret == DBErrors::NEED_REWRITE) {
             fprintf(stderr,
                     "Wallet needed to be rewritten: restart %s to complete",
                     PACKAGE_NAME);
             return nullptr;
         } else {
             fprintf(stderr, "Error loading %s", name.c_str());
             return nullptr;
         }
     }
 
     return wallet_instance;
 }
 
 static void WalletShowInfo(CWallet *wallet_instance) {
     // lock required because of some AssertLockHeld()
     LOCK(wallet_instance->cs_wallet);
 
     fprintf(stdout, "Wallet info\n===========\n");
     fprintf(stdout, "Encrypted: %s\n",
             wallet_instance->IsCrypted() ? "yes" : "no");
     fprintf(stdout, "HD (hd seed available): %s\n",
             wallet_instance->GetHDChain().seed_id.IsNull() ? "no" : "yes");
     fprintf(stdout, "Keypool Size: %u\n", wallet_instance->GetKeyPoolSize());
     fprintf(stdout, "Transactions: %zu\n", wallet_instance->mapWallet.size());
     fprintf(stdout, "Address Book: %zu\n",
             wallet_instance->mapAddressBook.size());
 }
 
 bool ExecuteWalletToolFunc(const std::string &command,
                            const std::string &name) {
     fs::path path = fs::absolute(name, GetWalletDir());
 
     if (command == "create") {
         std::shared_ptr<CWallet> wallet_instance = CreateWallet(name, path);
         if (wallet_instance) {
             WalletShowInfo(wallet_instance.get());
             wallet_instance->Flush();
         }
     } else if (command == "info") {
         if (!fs::exists(path)) {
             fprintf(stderr, "Error: no wallet file at %s\n", name.c_str());
             return false;
         }
         std::string error;
         if (!WalletBatch::VerifyEnvironment(path, error)) {
             fprintf(
                 stderr,
                 "Error loading %s. Is wallet being used by other process?\n",
                 name.c_str());
             return false;
         }
         std::shared_ptr<CWallet> wallet_instance = LoadWallet(name, path);
         if (!wallet_instance) {
             return false;
         }
         WalletShowInfo(wallet_instance.get());
         wallet_instance->Flush();
     } else {
         fprintf(stderr, "Invalid command: %s\n", command.c_str());
         return false;
     }
 
     return true;
 }
 } // namespace WalletTool