启动插件设置好邮箱信息之后，点击测试邮箱报错Attempt to assign property "from" on null

[wangdgui]

Attempt to assign property "from" on null Error: Attempt to assign property "from" on null in /app/usr/plugins/CommentToMail/Action.php:341 Stack trace:

0 /app/usr/plugins/CommentToMail/Action.php(405): CommentToMail_Action->testMail()

1 /app/var/Widget/Action.php(71): CommentToMail_Action->action()

2 /app/var/Typecho/Widget.php(155): Widget\Action->execute()

3 /app/var/Typecho/Router.php(96): Typecho\Widget::widget('\Widget\Action', NULL, Array)

4 /app/index.php(23): Typecho\Router::dispatch()

5 {main}