From 86f3eec8e63db075b438236587c9ddd2ba7ebc00 Mon Sep 17 00:00:00 2001
From: ThomasV <thomasv@electrum.org>
Date: Tue, 10 Jun 2025 10:44:04 +0200
Subject: [PATCH] fix user-facing exception refreshing history after swap is
 refunded

(txbatcher first adds the tx unsigned)
---
 electrum/submarine_swaps.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/electrum/submarine_swaps.py b/electrum/submarine_swaps.py
index 8770bd859..f9747fda3 100644
--- a/electrum/submarine_swaps.py
+++ b/electrum/submarine_swaps.py
@@ -367,7 +367,11 @@ class SwapManager(Logger):
     @classmethod
     def extract_preimage(cls, swap: SwapData, claim_tx: Transaction) -> Optional[bytes]:
         for txin in claim_tx.inputs():
-            preimage = txin.witness_elements()[1]
+            witness = txin.witness_elements()
+            if not witness:
+                # tx may be unsigned
+                continue
+            preimage = witness[1]
             if sha256(preimage) == swap.payment_hash:
                 return preimage
         return None