1 files changed, 2 insertions, 1 deletions
diff --git a/clang/lib/Sema/SemaTemplateDeductionGuide.cpp b/clang/lib/Sema/SemaTemplateDeductionGuide.cpp
index ad50600..bfcd397 100644
--- a/clang/lib/Sema/SemaTemplateDeductionGuide.cpp
+++ b/clang/lib/Sema/SemaTemplateDeductionGuide.cpp
@@ -659,7 +659,8 @@ private:
                 SemaRef, MaterializedTypedefs, NestedPattern,
                 TransformingOuterPatterns ? &Args : nullptr)
                 .transform(NewDI);
-
+    if (!NewDI)
+      return nullptr;
     // Resolving a wording defect, we also inherit default arguments from the
     // constructor.
     ExprResult NewDefArg;