From 7446c516b56a6ffc26718da4eacdec78fb83ee47 Mon Sep 17 00:00:00 2001
From: Steven Serrata <sserrata@paloaltonetworks.com>
Date: Wed, 11 Dec 2024 10:49:56 -0600
Subject: [PATCH] add additional fallback case where propertyName not defined
 in properties and handle 0-length mapping

---
 .../src/theme/Schema/index.tsx                            | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/docusaurus-theme-openapi-docs/src/theme/Schema/index.tsx b/packages/docusaurus-theme-openapi-docs/src/theme/Schema/index.tsx
index 0538aecce..e2cbc831f 100644
--- a/packages/docusaurus-theme-openapi-docs/src/theme/Schema/index.tsx
+++ b/packages/docusaurus-theme-openapi-docs/src/theme/Schema/index.tsx
@@ -319,7 +319,7 @@ const DiscriminatorNode: React.FC<DiscriminatorNodeProps> = ({
 
   // default to empty object if no parent-level properties exist
   const discriminatorProperty = schema.properties
-    ? schema.properties![discriminator.propertyName]
+    ? (schema.properties![discriminator.propertyName] ?? {})
     : {};
 
   if (schema.allOf) {
@@ -341,6 +341,12 @@ const DiscriminatorNode: React.FC<DiscriminatorNodeProps> = ({
     discriminator.mapping = inferredMapping;
   }
 
+  // handle invalid discriminator definition where no discriminated schemas are defined
+  if (Object.keys(discriminator.mapping).length === 0) {
+    delete schema.discriminator;
+    return <SchemaNode schema={schema} schemaType={schemaType} />;
+  }
+
   // Merge sub schema discriminator property with parent
   Object.keys(discriminator.mapping).forEach((key) => {
     const subSchema = discriminator.mapping[key];