Index: lib/Sema/SemaChecking.cpp
===================================================================
--- lib/Sema/SemaChecking.cpp
+++ lib/Sema/SemaChecking.cpp
@@ -12101,7 +12101,7 @@
     ValueDecl *MD = ME->getMemberDecl();
     auto *FD = dyn_cast<FieldDecl>(MD);
     // We do not care about non-data members.
-    if (!FD || FD->isInvalidDecl())
+    if (!FD || FD->isInvalidDecl() || RD->isInvalidDecl())
       return;
 
     AnyIsPacked =
Index: test/Sema/address-packed.c
===================================================================
--- test/Sema/address-packed.c
+++ test/Sema/address-packed.c
@@ -329,3 +329,14 @@
   uint32_t *p32;
   p32 = &a[0].x; // no-warning
 }
+
+struct Invalid0 {
+  void *x;
+  struct fwd f; // expected-error {{incomplete type}} expected-note {{forward declaration}}
+} __attribute__((packed));
+
+
+void *g14(struct Invalid0 *ivl)
+{
+    return &(ivl->x);
+}