diff --git a/BTCPayServer/Controllers/WalletsController.cs b/BTCPayServer/Controllers/WalletsController.cs
index 89ea8a7e0..575c3bfba 100644
--- a/BTCPayServer/Controllers/WalletsController.cs
+++ b/BTCPayServer/Controllers/WalletsController.cs
@@ -410,7 +410,7 @@ namespace BTCPayServer.Controllers
             }
             psbt.SignAll(settings.AccountDerivation, signingKey, rootedKeyPath);
             ModelState.Remove(nameof(viewModel.PSBT));
-            return await WalletPSBTReady(walletId, psbt.ToBase64(), signingKey.GetWif(network.NBitcoinNetwork).ToString(), rootedKeyPath.ToString());
+            return await WalletPSBTReady(walletId, psbt.ToBase64(), signingKey.GetWif(network.NBitcoinNetwork).ToString(), rootedKeyPath?.ToString());
         }
 
         private string ValueToString(Money v, BTCPayNetworkBase network)