From 2e8ecf3dc07cb9786a9094f92efc680e9ddf4e9b Mon Sep 17 00:00:00 2001
From: Ilan Gitter <ilangitter@ip-192-168-183-80.eu-west-2.compute.internal>
Date: Thu, 4 Oct 2018 17:38:30 -0400
Subject: [PATCH] allow for nil block number to get most recent block

---
 accounts/abi/bind/backends/simulated.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go
index 7d11170e48..76c6aa9ea9 100644
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -188,6 +188,9 @@ func (b *SimulatedBackend) TransactionByHash(ctx context.Context, txHash common.
 // BlockByNumber retrieves a block from the database by number, caching it
 // (associated with its hash) if found.
 func (b *SimulatedBackend) BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error) {
+	if number == nil {
+		return b.blockchain.CurrentBlock(), nil
+	}
 	block := b.blockchain.GetBlockByNumber(number.Uint64())
 	if block == nil {
 		return nil, errBlockDoesNotExist