diff --git a/src/Session.php b/src/Session.php
index 0b26c29..42194ed 100644
--- a/src/Session.php
+++ b/src/Session.php
@@ -15,17 +15,17 @@ class Session
     /**
      * Session 数据存储键
      */
-    private const SESSION_KEY = 'kiri.session.data';
+    private const string SESSION_KEY = 'kiri.session.data';
     
     /**
      * Session ID 键
      */
-    private const SESSION_ID_KEY = 'kiri.session.id';
+    private const string SESSION_ID_KEY = 'kiri.session.id';
     
     /**
      * Session 名称
      */
-    private const SESSION_NAME = 'KIRI_SESSION_ID';
+    private const string SESSION_NAME = 'KIRI_SESSION_ID';
     
     /**
      * Session 存储路径
@@ -398,7 +398,6 @@ class Session
         }
         
         $oldSessionId = Context::get(self::SESSION_ID_KEY);
-        $sessionData = Context::get(self::SESSION_KEY, []);
         
         // 生成新的 Session ID
         $newSessionId = self::generateSessionId();