From a44a215177ab55b4a3b36a7980c313e908e2dd18 Mon Sep 17 00:00:00 2001
From: Pedro Branco <branco@uphold.com>
Date: Wed, 11 Oct 2017 11:12:59 +0100
Subject: [PATCH] Fix importmulti bug when importing an already imported key

---
 src/wallet/rpcdump.cpp         |  2 +-
 test/functional/importmulti.py | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/wallet/rpcdump.cpp b/src/wallet/rpcdump.cpp
index d6ea2a9db..3ec4a5efb 100644
--- a/src/wallet/rpcdump.cpp
+++ b/src/wallet/rpcdump.cpp
@@ -961,7 +961,7 @@ UniValue ProcessImport(CWallet * const pwallet, const UniValue& data, const int6
                 pwallet->SetAddressBook(vchAddress, label, "receive");
 
                 if (pwallet->HaveKey(vchAddress)) {
-                    return false;
+                    throw JSONRPCError(RPC_WALLET_ERROR, "The wallet already contains the private key for this address or script");
                 }
 
                 pwallet->mapKeyMetadata[vchAddress].nCreateTime = timestamp;
diff --git a/test/functional/importmulti.py b/test/functional/importmulti.py
index c1a42870e..a691595f1 100755
--- a/test/functional/importmulti.py
+++ b/test/functional/importmulti.py
@@ -160,6 +160,18 @@ class ImportMultiTest (BitcoinTestFramework):
         assert_equal(address_assert['ismine'], True)
         assert_equal(address_assert['timestamp'], timestamp)
 
+        self.log.info("Should not import an address with private key if is already imported")
+        result = self.nodes[1].importmulti([{
+            "scriptPubKey": {
+                "address": address['address']
+            },
+            "timestamp": "now",
+            "keys": [ self.nodes[0].dumpprivkey(address['address']) ]
+        }])
+        assert_equal(result[0]['success'], False)
+        assert_equal(result[0]['error']['code'], -4)
+        assert_equal(result[0]['error']['message'], 'The wallet already contains the private key for this address or script')
+
         # Address + Private key + watchonly
         self.log.info("Should not import an address with private key and with watchonly")
         address = self.nodes[0].validateaddress(self.nodes[0].getnewaddress())