From 221e2c789879de04ff49d5ccb1f8e7ebd9b95cd3 Mon Sep 17 00:00:00 2001
From: "nicolas.dorier" <nicolas.dorier@gmail.com>
Date: Wed, 7 Aug 2019 17:53:03 +0900
Subject: [PATCH] Fix "Key already added in dictionary" error when signing with
 ledger

---
 BTCPayServer/Services/LedgerHardwareWalletService.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/BTCPayServer/Services/LedgerHardwareWalletService.cs b/BTCPayServer/Services/LedgerHardwareWalletService.cs
index 5711fa91e..dea683799 100644
--- a/BTCPayServer/Services/LedgerHardwareWalletService.cs
+++ b/BTCPayServer/Services/LedgerHardwareWalletService.cs
@@ -126,11 +126,11 @@ namespace BTCPayServer.Services
                 .Inputs
                 .HDKeysFor(accountKey, accountKeyPath)
                 .Where(hd => !hd.Coin.PartialSigs.ContainsKey(hd.PubKey)) // Don't want to sign something twice
-                .GroupBy(hd => hd.Coin)
+                .GroupBy(hd => hd.Coin.PrevOut, hd => hd)
                 .Select(i => new SignatureRequest()
                 {
-                    InputCoin = i.Key.GetSignableCoin(),
-                    InputTransaction = i.Key.NonWitnessUtxo,
+                    InputCoin = i.First().Coin.GetSignableCoin(),
+                    InputTransaction = i.First().Coin.NonWitnessUtxo,
                     KeyPath = i.First().RootedKeyPath.KeyPath,
                     PubKey = i.First().PubKey
                 }).ToArray();