--- class.tx_indexedsearch.php	2011-10-12 16:46:16.000000000 +0200
+++ class.tx_indexedsearch.php.new	2011-10-12 16:46:08.000000000 +0200
@@ -2222,7 +2222,7 @@
 			// Add &type and &MP variable:
 		if ($row['data_page_type']) $urlParameters['type'] = $row['data_page_type'];
 		if ($row['data_page_mp']) $urlParameters['MP'] = $row['data_page_mp'];
-		if ($row['sys_language_uid']) $urlParameters['L'] = $row['sys_language_uid'];
+		$urlParameters['L'] = ($row['sys_language_uid'] ? $row['sys_language_uid'] : '0');
 
 			// markup-GET vars:
 		$urlParameters = array_merge($urlParameters, $markUpSwParams);