From 53ac85cfd3188f96bc595a131732bbdbd5d49687 Mon Sep 17 00:00:00 2001
From: Taylor Gerring <taylor.gerring@gmail.com>
Date: Wed, 11 Mar 2015 10:27:24 -0500
Subject: [PATCH] BlockHash must be a string

---
 rpc/args.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/rpc/args.go b/rpc/args.go
index ff41e501f..26a61b1a1 100644
--- a/rpc/args.go
+++ b/rpc/args.go
@@ -40,7 +40,12 @@ func (args *GetBlockByHashArgs) UnmarshalJSON(b []byte) (err error) {
 	if len(obj) < 1 {
 		return errArguments
 	}
-	args.BlockHash = obj[0].(string)
+
+	argstr, ok := obj[0].(string)
+	if !ok {
+		return errDecodeArgs
+	}
+	args.BlockHash = argstr
 
 	if len(obj) > 1 {
 		args.Transactions = obj[1].(bool)