From 57824213434cfe6ea70bb63b9aa024127104c654 Mon Sep 17 00:00:00 2001
From: callebtc <93376500+callebtc@users.noreply.github.com>
Date: Fri, 23 Jun 2023 20:41:29 +0200
Subject: [PATCH] fee reserve 0 doesnt like log

---
 cashu/core/helpers.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cashu/core/helpers.py b/cashu/core/helpers.py
index b5e590e..7c20faa 100644
--- a/cashu/core/helpers.py
+++ b/cashu/core/helpers.py
@@ -52,4 +52,6 @@ def calculate_number_of_blank_outputs(fee_reserve_sat: int):
     see NUT-08 for details.
     """
     assert fee_reserve_sat >= 0, "Fee reserve can't be negative."
-    return max(math.ceil(math.log2(fee_reserve_sat)), 1)
+    if fee_reserve_sat == 0:
+        return 1
+    return math.ceil(math.log2(fee_reserve_sat))