From e8fef8c511d6edfb89df6a2e0fdb73bbea3714c6 Mon Sep 17 00:00:00 2001
From: Shbli <shbli@peoplecorpgaming.com>
Date: Wed, 27 Dec 2017 17:06:19 +0300
Subject: [PATCH] eth: Fix #3483

---
 eth/api_backend.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/eth/api_backend.go b/eth/api_backend.go
index 00424caed2..37fa5999a8 100644
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@@ -20,6 +20,7 @@ import (
 	"context"
 	"math/big"
 
+	"errors"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/math"
@@ -96,6 +97,10 @@ func (b *EthAPIBackend) StateAndHeaderByNumber(ctx context.Context, blockNr rpc.
 	// Otherwise resolve the block number and return its state
 	header, err := b.HeaderByNumber(ctx, blockNr)
 	if header == nil || err != nil {
+		//if the error is nil, let's create a generic error message instead of returning a fully null result
+		if err == nil {
+			err = errors.New("blockchain header is nil")
+		}
 		return nil, nil, err
 	}
 	stateDb, err := b.eth.BlockChain().StateAt(header.Root)