diff --git a/core/Url.php b/core/Url.php
index 59eaadb96a8a2e931fa7eaef83a7a3e370f295a5..eaa69978506df835ee3d462166df256c6f1a2914 100644
--- a/core/Url.php
+++ b/core/Url.php
@@ -186,7 +186,7 @@ class Piwik_Url
 		
 		if ($host === false)
 		{
-			$host = $_SERVER['HTTP_HOST'];
+			$host = @$_SERVER['HTTP_HOST'];
 			if (empty($host)) // if no current host, assume valid
 			{
 				return true;