From a511ab8e78164bb1ed617a66b59d4cadfc46c501 Mon Sep 17 00:00:00 2001
From: ThomasV <thomasv@electrum.org>
Date: Fri, 25 Apr 2025 12:40:18 +0200
Subject: [PATCH] lnwatcher.maybe_extract_preimage: early return if tx is
 unsigned

---
 electrum/lnwatcher.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/electrum/lnwatcher.py b/electrum/lnwatcher.py
index c4c2c9d13..d81c2326b 100644
--- a/electrum/lnwatcher.py
+++ b/electrum/lnwatcher.py
@@ -195,6 +195,9 @@ class LNWatcher(Logger, EventListener):
         return True
 
     def maybe_extract_preimage(self, chan: 'AbstractChannel', spender_tx: Transaction, prevout: str):
+        if not spender_tx.is_complete():
+            self.logger.info('spender tx is unsigned')
+            return
         txin_idx = spender_tx.get_input_idx_that_spent_prevout(TxOutpoint.from_str(prevout))
         assert txin_idx is not None
         spender_txin = spender_tx.inputs()[txin_idx]