From e3166864a4c56e32c57010515e005dd00ef7dcd2 Mon Sep 17 00:00:00 2001
From: clearly <910372762@qq.com>
Date: Tue, 22 Oct 2019 13:57:53 +0800
Subject: [PATCH] prepare_replacement_transaction

---
 client_sdk_python/utils/transactions.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/client_sdk_python/utils/transactions.py b/client_sdk_python/utils/transactions.py
index 47f7c76..8ba21cb 100644
--- a/client_sdk_python/utils/transactions.py
+++ b/client_sdk_python/utils/transactions.py
@@ -172,7 +172,7 @@ def assert_valid_transaction_params(transaction_params):
 
 
 def prepare_replacement_transaction(web3, current_transaction, new_transaction):
-    if current_transaction['blockHash'] is not None:
+    if current_transaction['blockHash'] !=  HexBytes('0x0000000000000000000000000000000000000000000000000000000000000000'):
         raise ValueError('Supplied transaction with hash {} has already been mined'
                          .format(current_transaction['hash']))