diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index 5a6d85c..f40896d 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -354,7 +354,8 @@
 }
 
 bool Decl::isInStdNamespace() const {
-  return getDeclContext()->isStdNamespace();
+  const DeclContext *DC = getDeclContext();
+  return DC && DC->isStdNamespace();
 }
 
 TranslationUnitDecl *Decl::getTranslationUnitDecl() {