From d17abd3f0bb52f0338529cf19630b911626e6a89 Mon Sep 17 00:00:00 2001
From: Carmine DiMascio <cdimasci@amazon.com>
Date: Wed, 6 Jan 2021 08:54:38 -0500
Subject: [PATCH] fix: preprocessor type of undefined

---
 src/middlewares/parsers/schema.preprocessor.ts | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/middlewares/parsers/schema.preprocessor.ts b/src/middlewares/parsers/schema.preprocessor.ts
index ab557617..ba8cd9e3 100644
--- a/src/middlewares/parsers/schema.preprocessor.ts
+++ b/src/middlewares/parsers/schema.preprocessor.ts
@@ -249,9 +249,11 @@ export class SchemaPreprocessor {
       const options = opts[kind];
       options.path = node.path;
 
-      this.handleSerDes(pschema, nschema, options);
-      this.handleReadonly(pschema, nschema, options);
-      this.processDiscriminator(pschema, nschema, options);
+      if (nschema) {
+        this.handleSerDes(pschema, nschema, options);
+        this.handleReadonly(pschema, nschema, options);
+        this.processDiscriminator(pschema, nschema, options);
+      }
     }
   }