Fixes #632.

40b6b607 · Qiang Xue · 90ed7762 · 40b6b607
Commit 40b6b607 authored Jul 17, 2013 by Qiang Xue
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Html.php framework/yii/helpers/base/Html.php +1 -1

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--- 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;