From 9ad695d52c486d26d32ae07ffdb31d4b20cb68a7 Mon Sep 17 00:00:00 2001
From: William Cheng <wing328hk@gmail.com>
Date: Sat, 15 Apr 2023 15:54:54 +0800
Subject: [PATCH] better npe in processUseAllOfRefAsParent (openapi normalizer)
 (#15224)

---
 .../main/java/org/openapitools/codegen/OpenAPINormalizer.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java
index 6b98b0d5e24..81d7f4ab9e1 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java
@@ -514,6 +514,10 @@ public class OpenAPINormalizer {
             return;
         }
 
+        if (schema.getAllOf() == null) {
+            return;
+        }
+
         for (Object item : schema.getAllOf()) {
             if (!(item instanceof Schema)) {
                 throw new RuntimeException("Error! allOf schema is not of the type Schema: " + item);