woops, change json parse down here to

components/authenticator.js

@@ -92,7 +92,7 @@ function refreshAuth(accessToken, clientToken, selectedProfile) {
                 client_token: uuid(),
                 uuid: body.selectedProfile.id,
                 name: body.selectedProfile.name,
-                user_properties: JSON.stringify((body.user || {}).properties || {})
+                user_properties: JSON.stringify(body.user.properties || {})
             };
 
             resolve(userProfile);

package.json

@@ -1,6 +1,6 @@
 {
   "name": "minecraft-launcher-core",
-  "version": "2.3.0",
+  "version": "2.3.1",
   "description": "Module that downloads Minecraft assets and runs Minecraft. Also Supports Forge",
   "main": "index.js",
   "dependencies": {