From 5fac39db38ed302af421e56f321b979200332287 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Federico=20Kunze=20K=C3=BCllmer?=
 <31522760+fedekunze@users.noreply.github.com>
Date: Thu, 2 Sep 2021 19:47:39 +0200
Subject: [PATCH] evm: conditional hook snapshot (#520)

---
 x/evm/keeper/state_transition.go | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/x/evm/keeper/state_transition.go b/x/evm/keeper/state_transition.go
index 77d08c2f..5f8fb993 100644
--- a/x/evm/keeper/state_transition.go
+++ b/x/evm/keeper/state_transition.go
@@ -175,8 +175,11 @@ func (k *Keeper) ApplyTransaction(tx *ethtypes.Transaction) (*types.MsgEthereumT
 		panic("context stack shouldn't be dirty before apply message")
 	}
 
-	// Contains the tx processing and post processing in same scope
-	revision := k.Snapshot()
+	var revision int
+	if k.hooks != nil {
+		// snapshot to contain the tx processing and post processing in same scope
+		revision = k.Snapshot()
+	}
 
 	// pass false to execute in real mode, which do actual gas refunding
 	res, err := k.ApplyMessage(evm, msg, ethCfg, false)