From a6ed71c6472c8ea0f680507ae34f56aeaf6bb3d2 Mon Sep 17 00:00:00 2001
From: Hugh Bellamy <hughbellars@gmail.com>
Date: Sat, 17 Jun 2017 17:49:26 +0700
Subject: [PATCH] Throw ArgumentNullException on Unix calling
 Marshal.IsComObject(null) (#12348)

---
 .../src/System/Runtime/InteropServices/NonPortable.cs      | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/mscorlib/src/System/Runtime/InteropServices/NonPortable.cs b/src/mscorlib/src/System/Runtime/InteropServices/NonPortable.cs
index c79af8b459..59229ed528 100644
--- a/src/mscorlib/src/System/Runtime/InteropServices/NonPortable.cs
+++ b/src/mscorlib/src/System/Runtime/InteropServices/NonPortable.cs
@@ -153,7 +153,12 @@ namespace System.Runtime.InteropServices
         }
 
         public static bool IsComObject(object o)
-        { 
+        {
+            if (o == null)
+            {
+                throw new ArgumentNullException(nameof(o));
+            }
+
             return false;
         }
 
-- 
2.34.1