From 6b4efa7ff5537a7cdb1d73b18dd75f56bdadc032 Mon Sep 17 00:00:00 2001
From: Aaron Buchwald <aaron.buchwald56@gmail.com>
Date: Thu, 17 Sep 2020 09:20:36 -0400
Subject: Fix potential nil pointer dereference

---
 core/types/block.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/types/block.go b/core/types/block.go
index 99d6cc8..0a93601 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -330,6 +330,9 @@ func (b *Block) SetExtraData(data []byte) {
 }
 
 func (b *Block) ExtraData() []byte {
+	if b.extdata == nil {
+		return nil
+	}
 	return *b.extdata
 }
 
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