diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -4609,6 +4609,8 @@
     // Sign the transaction
     auto locked_chain = pwallet->chain().lock();
     LOCK(pwallet->cs_wallet);
+    EnsureWalletIsUnlocked(pwallet);
+
     return SignTransaction(pwallet->chain(), mtx, request.params[1], pwallet,
                            false, request.params[2]);
 }
diff --git a/test/functional/rpc_signrawtransaction.py b/test/functional/rpc_signrawtransaction.py
--- a/test/functional/rpc_signrawtransaction.py
+++ b/test/functional/rpc_signrawtransaction.py
@@ -52,6 +52,17 @@
         # 2) No script verification error occurred
         assert 'errors' not in rawTxSigned
 
+    def test_with_lock_outputs(self):
+        """Test correct error reporting when trying to sign a locked output"""
+        self.nodes[0].encryptwallet("password")
+
+        rawTx = '020000000156b958f78e3f24e0b2f4e4db1255426b0902027cb37e3ddadb52e37c3557dddb0000000000ffffffff01c0a6b929010000001600149a2ee8c77140a053f36018ac8124a6ececc1668a00000000'
+
+        assert_raises_rpc_error(-13,
+                                "Please enter the wallet passphrase with walletpassphrase first",
+                                self.nodes[0].signrawtransactionwithwallet,
+                                rawTx)
+
     def script_verification_error_test(self):
         """Creates and signs a raw transaction with valid (vin 0), invalid (vin 1) and one missing (vin 2) input script.
 
@@ -236,6 +247,7 @@
         self.script_verification_error_test()
         self.test_sighashes()
         self.multiwallet_signing_test()
+        self.test_with_lock_outputs()
 
 
 if __name__ == '__main__':