Index: trunk/core/kernel/application.php
===================================================================
diff -u -N -r7991 -r7997
--- trunk/core/kernel/application.php	(.../application.php)	(revision 7991)
+++ trunk/core/kernel/application.php	(.../application.php)	(revision 7997)
@@ -1678,9 +1678,11 @@
 
 		if ($res) {
 			$this->Caches['PhraseList'] = $res['PhraseList'] ? explode(',', $res['PhraseList']) : array();
-
+			
 			$config_ids = $res['ConfigVariables'] ? explode(',', $res['ConfigVariables']) : array();
-			$config_ids = array_diff($config_ids, $this->Caches['ConfigVariables']);
+			if (isset($this->Caches['ConfigVariables'])) {
+				$config_ids = array_diff($config_ids, $this->Caches['ConfigVariables']);
+			}
 		}
 		else {
 			$config_ids = array();