From f81ca5284f99d0bc291f5636242fa1f9d1d6f59c Mon Sep 17 00:00:00 2001
From: Charles Iliya Krempeaux <iamreiver@gmail.com>
Date: Tue, 10 Jul 2018 20:56:30 -0700
Subject: [PATCH] utf8s.RuneReader

---
 errors.go     | 1 +
 runereader.go | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/errors.go b/errors.go
index 2e92185..4cad8d5 100644
--- a/errors.go
+++ b/errors.go
@@ -8,5 +8,6 @@ var (
 	errInternalError = errors.New("Internal Error")
 	errInvalidUTF8   = internalInvalidUTF8Complainer{}
 	errNilReader     = internalNilReaderComplainer{}
+	errNilReceiver   = errors.New("Nil Receiver")
 	errNilWriter     = internalNilWriterComplainer{}
 )
diff --git a/runereader.go b/runereader.go
index b99d658..9afe93c 100644
--- a/runereader.go
+++ b/runereader.go
@@ -16,6 +16,10 @@ func NewRuneReader(reader io.Reader) *RuneReader {
 }
 
 func (receiver *RuneReader) ReadRune() (rune, int, error) {
+	if nil == receiver {
+		return 0, 0, errNilReceiver
+	}
+
 	reader := receiver.reader
 	if nil == reader {
 		return 0, 0, errNilReader