From af11ebb3c31700e2273de84b325434dad0d17ecd Mon Sep 17 00:00:00 2001
From: SomberNight <somber.night@protonmail.com>
Date: Sun, 8 Jun 2025 20:22:45 +0000
Subject: [PATCH] interface: _search_headers_backwards: add an assert

---
 electrum/interface.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/electrum/interface.py b/electrum/interface.py
index 600d21d61..5fdc3f069 100644
--- a/electrum/interface.py
+++ b/electrum/interface.py
@@ -1130,6 +1130,7 @@ class Interface(Logger):
         while await iterate():
             bad, bad_header = height, header
             delta = self.tip - height
+            assert delta > 0, delta
             height = self.tip - 2 * delta
 
         _assert_header_does_not_check_against_any_chain(bad_header)