From af19b4f2e779f11dd7a423b5d3eddb325bf58b86 Mon Sep 17 00:00:00 2001
From: Vasiliy Tolstov <v.tolstov@unistack.org>
Date: Mon, 12 Apr 2021 19:12:16 +0300
Subject: [PATCH] fix nil buf check

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
---
 json.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/json.go b/json.go
index 49c630d..0906cd5 100644
--- a/json.go
+++ b/json.go
@@ -23,7 +23,7 @@ func (c *jsonCodec) Marshal(b interface{}) ([]byte, error) {
 }
 
 func (c *jsonCodec) Unmarshal(b []byte, v interface{}) error {
-	if b == nil {
+	if len(b) == 0 {
 		return nil
 	}
 	switch m := v.(type) {
@@ -49,6 +49,8 @@ func (c *jsonCodec) ReadBody(conn io.Reader, b interface{}) error {
 		buf, err := ioutil.ReadAll(conn)
 		if err != nil {
 			return err
+		} else if len(buf) == 0 {
+			return nil
 		}
 		m.Data = buf
 		return nil