a fix for this issue:

danielkerr · danielkerr · commit a9156a8ead0f · 2012-12-28T00:39:40.000+08:00
http://forum.opencart.com/viewtopic.php?t=44763#p334027
diff --git a/upload/system/startup.php b/upload/system/startup.php
@@ -69,6 +69,10 @@ function clean($data) {
 	} 
 }
 
+if (!isset($_SERVER['HTTP_HOST'])) {
+	$_SERVER['HTTP_HOST'] = getenv('HTTP_HOST');
+}
+
 // Helper
 require_once(DIR_SYSTEM . 'helper/json.php'); 
 require_once(DIR_SYSTEM . 'helper/utf8.php'); 

Original file line number	Diff line number	Diff line change
`@@ -69,6 +69,10 @@ function clean($data) {`
`69`	`69`	`}`
`70`	`70`	`}`
`71`	`71`
	`72`	`+if (!isset($_SERVER['HTTP_HOST'])) {`
	`73`	`+ $_SERVER['HTTP_HOST'] = getenv('HTTP_HOST');`
	`74`	`+}`
	`75`	`+`
`72`	`76`	`// Helper`
`73`	`77`	`require_once(DIR_SYSTEM . 'helper/json.php');`
`74`	`78`	`require_once(DIR_SYSTEM . 'helper/utf8.php');`