From 40b6b607c84cf21234e43904126fa4ea366d00bc Mon Sep 17 00:00:00 2001
From: Qiang Xue <qiang.xue@gmail.com>
Date: Wed, 17 Jul 2013 20:12:19 -0400
Subject: [PATCH] Fixes #632.

---
 framework/yii/helpers/base/Html.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/framework/yii/helpers/base/Html.php b/framework/yii/helpers/base/Html.php
index ad83eed..42f0b14 100644
--- a/framework/yii/helpers/base/Html.php
+++ b/framework/yii/helpers/base/Html.php
@@ -1398,7 +1398,7 @@ class Html
 			return Yii::$app->getRequest()->getUrl();
 		} else {
 			$url = Yii::getAlias($url);
-			if ($url[0] === '/' || $url[0] === '#' || strpos($url, '://')) {
+			if ($url !== '' && ($url[0] === '/' || $url[0] === '#' || strpos($url, '://'))) {
 				return $url;
 			} else {
 				return Yii::$app->getRequest()->getBaseUrl() . '/' . $url;