From cb0a5773cd3b3564c4a19b85aaddd3d9cc63a3c7 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Sat, 4 Nov 2017 16:54:44 -0400
Subject: bug fix

---
 source/slang/lower.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'source/slang/lower.cpp')

diff --git a/source/slang/lower.cpp b/source/slang/lower.cpp
index bdd041f71..7f18659ae 100644
--- a/source/slang/lower.cpp
+++ b/source/slang/lower.cpp
@@ -2572,7 +2572,8 @@ struct LoweringVisitor
         else if (auto thisSubst = dynamic_cast<ThisTypeSubstitution*>(inSubstitutions))
         {
             RefPtr<ThisTypeSubstitution> result = new ThisTypeSubstitution();
-            result->sourceType = translateVal(result->sourceType);
+            if (result->sourceType)
+                result->sourceType = translateVal(result->sourceType);
             return result;
         }
         return nullptr;
-- 
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