diff --git a/clang/unittests/Sema/CodeCompleteTest.cpp b/clang/unittests/Sema/CodeCompleteTest.cpp
index ab1792b..a9441a6 100644
--- a/clang/unittests/Sema/CodeCompleteTest.cpp
+++ b/clang/unittests/Sema/CodeCompleteTest.cpp
@@ -481,4 +481,12 @@
   )cpp";
   EXPECT_THAT(collectPreferredTypes(Code), Each("vector<int>"));
 }
+
+TEST(PreferredTypeTest, NoCrashOnInvalidTypes) {
+  StringRef Code = R"cpp(
+    auto x = decltype(&1)(^);
+    auto y = new decltype(&1)(^);
+  )cpp";
+  EXPECT_THAT(collectPreferredTypes(Code), Each("NULL TYPE"));
+}
 } // namespace