diff --git a/clang/lib/AST/QualTypeNames.cpp b/clang/lib/AST/QualTypeNames.cpp
--- a/clang/lib/AST/QualTypeNames.cpp
+++ b/clang/lib/AST/QualTypeNames.cpp
@@ -192,7 +192,7 @@
       // Ignore inline namespace;
       NS = dyn_cast<NamespaceDecl>(NS->getDeclContext());
     }
-    if (NS->getDeclName()) {
+    if (NS && NS->getDeclName()) {
       return createNestedNameSpecifier(Ctx, NS, WithGlobalNsPrefix);
     }
     return nullptr;  // no starting '::', no anonymous
diff --git a/clang/unittests/Tooling/QualTypeNamesTest.cpp b/clang/unittests/Tooling/QualTypeNamesTest.cpp
--- a/clang/unittests/Tooling/QualTypeNamesTest.cpp
+++ b/clang/unittests/Tooling/QualTypeNamesTest.cpp
@@ -223,6 +223,17 @@
       "}\n"
   );
 
+  TypeNameVisitor InlineNamespace;
+  InlineNamespace.ExpectedQualTypeNames["c"] = "B::C";
+  InlineNamespace.runOver("inline namespace A {\n"
+                          "  namespace B {\n"
+                          "    class C {};\n"
+                          "  }\n"
+                          "}\n"
+                          "using namespace A::B;\n"
+                          "C c;\n",
+                          TypeNameVisitor::Lang_CXX11);
+
   TypeNameVisitor AnonStrucs;
   AnonStrucs.ExpectedQualTypeNames["a"] = "short";
   AnonStrucs.ExpectedQualTypeNames["un_in_st_1"] =