Index: typo3/sysext/cms/tslib/class.tslib_pibase.php
===================================================================
--- typo3/sysext/cms/tslib/class.tslib_pibase.php	(revision 7442)
+++ typo3/sysext/cms/tslib/class.tslib_pibase.php	(working copy)
@@ -218,9 +218,9 @@
 				$GLOBALS['TSFE']->reqCHash();
 			}
 		}
-		if ($GLOBALS['TSFE']->config['config']['language'])	{
+		if (!empty($GLOBALS['TSFE']->config['config']['language']))	{
 			$this->LLkey = $GLOBALS['TSFE']->config['config']['language'];
-			if ($GLOBALS['TSFE']->config['config']['language_alt'])	{
+			if (!empty($GLOBALS['TSFE']->config['config']['language_alt']))	{
 				$this->altLLkey = $GLOBALS['TSFE']->config['config']['language_alt'];
 			}
 		}