From 5f785131aec49dc0fa3ba91e485def52972d439d Mon Sep 17 00:00:00 2001
From: CyrusNajmabadi <cyrusn@microsoft.com>
Date: Fri, 11 Nov 2016 11:53:41 -0800
Subject: [PATCH] Add in null check.

---
 src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs b/src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs
index c542f427f17..2decaef2b2b 100644
--- a/src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs
+++ b/src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs
@@ -256,8 +256,8 @@ public SyntaxTriviaList InsertRange(int index, IEnumerable<SyntaxTrivia> trivia)
             }
 
             // Just return ourselves if we're not being asked to add anything.
-            var triviaList = trivia as ICollection;
-            if (triviaList.Count == 0)
+            var triviaCollection = trivia as ICollection;
+            if (triviaCollection != null && triviaCollection.Count == 0)
             {
                 return this;
             }
-- 
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