From db7f4e4d044a02f90e042c5e64dde5c73718a02e Mon Sep 17 00:00:00 2001
From: Selmar Kok <skok@asobostudio.com>
Date: Wed, 10 Oct 2018 18:10:58 +0200
Subject: [PATCH] fix an issue when serializing an empty extension object would
 serialize as type null (and thus deserialize as type null, causing it to be
 ignored)

---
 tiny_gltf.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tiny_gltf.h b/tiny_gltf.h
index 9549d78..2a9b3a6 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -4126,7 +4126,8 @@ static void SerializeExtensionMap(ExtensionMap &extensions, json &o) {
     json ret;
     if (ValueToJson(extIt->second, &ret)) {
       extMap[extIt->first] = ret;
-    } else {
+    }
+    if(ret.is_null()) {
       if (!(extIt->first.empty())) { // name should not be empty, but for sure 
         // create empty object so that an extension name is still included in json.
         extMap[extIt->first] = json({});