From 74854d55a099f6db1629a92d744b77b0548093d0 Mon Sep 17 00:00:00 2001
From: Daniel Tschinder <daniel.tschinder@researchgate.net>
Date: Sun, 11 Feb 2018 18:28:34 +0100
Subject: [PATCH] Read-only AST types

ref: graphql/graphql-js#1121
---
 src/Utils/ASTDefinitionBuilder.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Utils/ASTDefinitionBuilder.php b/src/Utils/ASTDefinitionBuilder.php
index 7649796..d6d7f7a 100644
--- a/src/Utils/ASTDefinitionBuilder.php
+++ b/src/Utils/ASTDefinitionBuilder.php
@@ -204,9 +204,9 @@ class ASTDefinitionBuilder
         return [
             'type' => $this->buildOutputType($field->type),
             'description' => $this->getDescription($field),
-            'args' => $this->makeInputValues($field->arguments),
+            'args' => $field->arguments ? $this->makeInputValues($field->arguments) : null,
             'deprecationReason' => $this->getDeprecationReason($field),
-            'astNode' => $field
+            'astNode' => $field,
         ];
     }