From d0c429e87f56f246232e0dff792200d4b3808838 Mon Sep 17 00:00:00 2001
From: ThomasV <thomasv@electrum.org>
Date: Thu, 29 May 2025 18:30:14 +0200
Subject: [PATCH] txbatcher: fix max() over empty list

---
 electrum/txbatcher.py | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/electrum/txbatcher.py b/electrum/txbatcher.py
index 7d34ceeb9..a7fb8aca5 100644
--- a/electrum/txbatcher.py
+++ b/electrum/txbatcher.py
@@ -453,10 +453,14 @@ class TxBatch(Logger):
             try:
                 tx = self._create_batch_tx(base_tx, to_sweep_now, to_pay)
             except NotEnoughFunds:
-                k = max(to_pay, key=lambda x: x.value)
-                self.logger.info(f'Not enough funds, removing output {k}')
-                to_pay.remove(k)
-                continue
+                if to_pay:
+                    k = max(to_pay, key=lambda x: x.value)
+                    self.logger.info(f'Not enough funds, removing output {k}')
+                    to_pay.remove(k)
+                    continue
+                else:
+                    self.logger.info(f'Not enough funds, waiting')
+                    return
             # 100 kb max standardness rule
             if tx.estimated_size() < 100_000:
                 break