From aceaaa517834fa8dfc5121b66dfd633f0b10ca8f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Tue, 12 Apr 2016 16:48:43 +0300
Subject: [PATCH] eth: gracefully fail if chain config is missing

---
 eth/backend.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/eth/backend.go b/eth/backend.go
index f4282d59f..cab83588c 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -19,6 +19,7 @@ package eth
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"math/big"
 	"os"
@@ -243,6 +244,9 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 		glog.V(logger.Info).Infoln("WARNING: Wrote default ethereum genesis block")
 	}
 
+	if config.ChainConfig == nil {
+		return nil, errors.New("missing chain config")
+	}
 	eth.chainConfig = config.ChainConfig
 	eth.chainConfig.VmConfig = vm.Config{
 		EnableJit: config.EnableJit,