From 794812fc2f18767416c2d4c39605f4d8016cc4dc Mon Sep 17 00:00:00 2001
From: Jim Lawson
Date: Fri, 7 Jul 2017 13:00:47 -0700
Subject: Ensure IO is non-null before attempting to autoWrapPorts. (#643)

---
 src/main/scala/chisel3/compatibility.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/scala/chisel3/compatibility.scala b/src/main/scala/chisel3/compatibility.scala
index b9357bbd..4223d63b 100644
--- a/src/main/scala/chisel3/compatibility.scala
+++ b/src/main/scala/chisel3/compatibility.scala
@@ -238,7 +238,7 @@ package object Chisel {     // scalastyle:ignore package.object.name
       this(Option(_clock), Option(_reset))(moduleCompileOptions)
 
     override def _autoWrapPorts() = {
-      if (!_ioPortBound()) {
+      if (!_ioPortBound() && io != null) {
         IO(io)
       }
     }
-- 
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