[Bug] Opening /loginpage.php when already logged in will cause the page to continously flash

[boomzero]

• 我已确认了XMOJ增强脚本已为最新版，且最新版未修复这个 Bug 。
• 我已在 Issues 页面 中搜索，确认了这一 Bug 未被提交过。

描述

Opening /loginpage.php when already logged in will cause the page to continously flash.

Screen.Recording.2025-07-09.at.19.08.36.mov

重现步骤

1. log in
2. visit /loginpage.php

控制台错误信息

(请补充控制台错误信息或留空)

[boomzero]

fixed by #817