From 7c7cff7ec11025a4d739ff81b83d20675a04732c Mon Sep 17 00:00:00 2001
From: Yuan Gao <tinagao@google.com>
Date: Tue, 1 Nov 2016 14:00:46 -0700
Subject: [PATCH] Fix the error when there's no radioGroup

---
 src/lib/radio/radio.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/radio/radio.ts b/src/lib/radio/radio.ts
index bae13f07c039..bd71acd4bbb1 100644
--- a/src/lib/radio/radio.ts
+++ b/src/lib/radio/radio.ts
@@ -420,7 +420,7 @@ export class MdRadioButton implements OnInit {
     // emit its event object to the `change` output.
     event.stopPropagation();
 
-    let groupValueChanged = this.value != this.radioGroup.value;
+    let groupValueChanged = this.radioGroup && this.value != this.radioGroup.value;
     this.checked = true;
     this._emitChangeEvent();