From e13816f3fd7c5848b3ede5ac019c40f82e926bb3 Mon Sep 17 00:00:00 2001
From: AnnaShaleva <shaleva.ann@gmail.com>
Date: Wed, 27 Oct 2021 18:36:40 +0300
Subject: [PATCH] core: handle empty MPT batch properly

It's OK to have it.
---
 pkg/core/mpt/batch.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/core/mpt/batch.go b/pkg/core/mpt/batch.go
index d2b0349ac..11f26752c 100644
--- a/pkg/core/mpt/batch.go
+++ b/pkg/core/mpt/batch.go
@@ -43,6 +43,9 @@ func (b *Batch) Add(key []byte, value []byte) {
 // and won't strip the resulting branch node.
 // However it is used mostly after the block processing to update MPT and error is not expected.
 func (t *Trie) PutBatch(b Batch) (int, error) {
+	if len(b.kv) == 0 {
+		return 0, nil
+	}
 	r, n, err := t.putBatch(b.kv)
 	t.root = r
 	return n, err