diff --git a/data/script/furatalog.sessions.php b/data/script/furatalog.sessions.php
index 09dc89f..7c19acf 100644
--- a/data/script/furatalog.sessions.php
+++ b/data/script/furatalog.sessions.php
@@ -35,7 +35,7 @@ class furatalogSessions {
         unset($this->dataObj->{$varName});
     }
 
-    public function issetSessionData() {
+    public function issetSessionData($varName) {
         return isset($this->dataObj->{$varName});
     }