From 0a1542e2496769a114ab9c1370b4ace4c6505a91 Mon Sep 17 00:00:00 2001
From: ThomasV <thomasv@electrum.org>
Date: Tue, 20 Feb 2018 09:58:36 +0100
Subject: [PATCH] fix #3929

---
 lib/wallet.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/wallet.py b/lib/wallet.py
index 90e47c436..4d513ea26 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -1720,7 +1720,8 @@ class Abstract_Wallet(PrintError):
             if fiat_value is not None:
                 return fiat_value
             else:
-                return self.price_at_timestamp(txid, price_func) * txin_value/Decimal(COIN)
+                p = self.price_at_timestamp(txid, price_func)
+                return None if p is None else p * txin_value/Decimal(COIN)
         else:
             # could be some coinjoin transaction..
             return None