diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1cde0fa59a4..e85aed0302a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,7 @@
 2012-11-06  Aldy Hernandez  <aldyh@redhat.com>
 
+	* cfghooks.c (copy_bbs): Handle a null loop_father.
+
 	* cgraph.c (cgraph_debug_gimple_stmt): Handle a null
 	current_function_decl.
 
diff --git a/gcc/cfghooks.c b/gcc/cfghooks.c
index d54dd469cf4..39f2f93d9be 100644
--- a/gcc/cfghooks.c
+++ b/gcc/cfghooks.c
@@ -1258,12 +1258,15 @@ copy_bbs (basic_block *bbs, unsigned n, basic_block *new_bbs,
       new_bb = new_bbs[i] = duplicate_block (bb, NULL, after);
       after = new_bb;
       bb->flags |= BB_DUPLICATED;
-      /* Possibly set loop header.  */
-      if (bb->loop_father->header == bb && bb->loop_father != base)
-	new_bb->loop_father->header = new_bb;
-      /* Or latch.  */
-      if (bb->loop_father->latch == bb && bb->loop_father != base)
-	new_bb->loop_father->latch = new_bb;
+      if (bb->loop_father)
+	{
+	  /* Possibly set loop header.  */
+	  if (bb->loop_father->header == bb && bb->loop_father != base)
+	    new_bb->loop_father->header = new_bb;
+	  /* Or latch.  */
+	  if (bb->loop_father->latch == bb && bb->loop_father != base)
+	    new_bb->loop_father->latch = new_bb;
+	}
     }
 
   /* Set dominators.  */