Fix bug in btngroup anchoring when anchor doesn't exist
Change-Id: Id89aa31edf6d9ee06046b22f6f4cefa34366f46e
diff --git a/dev/js/src/buttongroup.js b/dev/js/src/buttongroup.js
index 721fdcb..dabe710 100644
--- a/dev/js/src/buttongroup.js
+++ b/dev/js/src/buttongroup.js
@@ -57,7 +57,7 @@
* Define element following newly added buttons.
*/
anchor : function (anchor) {
- if (anchor.parentNode == this._el) {
+ if (anchor !== null && anchor.parentNode == this._el) {
this._anchor = anchor;
return true;
};