diff --git a/lib/Sema/SemaExprObjC.cpp b/lib/Sema/SemaExprObjC.cpp
index 548389d..8f4d677 100644
--- a/lib/Sema/SemaExprObjC.cpp
+++ b/lib/Sema/SemaExprObjC.cpp
@@ -239,8 +239,9 @@
     if (TypedefDecl *OCTD = dyn_cast_or_null<TypedefDecl>(IDecl)) {
       const ObjCInterfaceType *OCIT;
       OCIT = OCTD->getUnderlyingType()->getAsObjCInterfaceType();
-      if (OCIT)
-        ClassDecl = OCIT->getDecl();
+      if (!OCIT)
+        return Diag(receiverLoc, diag::err_invalid_receiver_to_message);
+      ClassDecl = OCIT->getDecl();
     }
   }
   assert(ClassDecl && "missing interface declaration");
diff --git a/test/SemaObjC/invalid-receiver.m b/test/SemaObjC/invalid-receiver.m
new file mode 100644
index 0000000..829ec5d
--- /dev/null
+++ b/test/SemaObjC/invalid-receiver.m
@@ -0,0 +1,9 @@
+// RUN: clang -fsyntax-only -verify %s
+
+typedef struct NotAClass {
+  int a, b;
+} NotAClass;
+
+void foo() {
+  [NotAClass nonexistent_method]; // expected-error {{invalid receiver to message expression}}
+}