From b1ecedd61c6f189a43c90ec2c0c1bdfa8c33861d Mon Sep 17 00:00:00 2001
From: Manodasan Wignarajah <mawign@microsoft.com>
Date: Thu, 1 Aug 2024 22:48:45 -0700
Subject: [PATCH] Guard against potential null (#1695)

---
 src/WinRT.Runtime/ComWrappersSupport.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/WinRT.Runtime/ComWrappersSupport.cs b/src/WinRT.Runtime/ComWrappersSupport.cs
index 6f78b5f8e..e7d5a721f 100644
--- a/src/WinRT.Runtime/ComWrappersSupport.cs
+++ b/src/WinRT.Runtime/ComWrappersSupport.cs
@@ -650,7 +650,8 @@ internal static Type GetRuntimeClassForTypeCreation(IInspectable inspectable, Ty
             // isn't already added.  On JIT, we can construct it at runtime.
             if (!RuntimeFeature.IsDynamicCodeCompiled)
             {
-                if (implementationType.IsInterface && 
+                if (implementationType != null &&
+                    implementationType.IsInterface && 
                     implementationType.IsGenericType &&
                     !TypedObjectFactoryCacheForType.ContainsKey(implementationType))
                 {