Index: sites/all/modules/i18n/i18n.module
===================================================================
--- sites/all/modules/i18n/i18n.module	(revision 2733)
+++ sites/all/modules/i18n/i18n.module	(working copy)
@@ -758,7 +758,9 @@
       $result = db_query("SELECT * FROM {i18n_variable} WHERE language = '%s'", $langcode);
       $i18n_conf[$langcode] = array();
       while ($variable = db_fetch_object($result)) {
-        $i18n_conf[$langcode][$variable->name] = unserialize($variable->value);
+        if (i18n_variable($variable->name)) {
+          $i18n_conf[$langcode][$variable->name] = unserialize($variable->value);
+        }
       }
       cache_set($cacheid, $i18n_conf[$langcode]);
     }