XenForo Server error on test outbound email

[Chromaniac]

So, I am on a slightly older version (2.3.4) and recently i noticed that test sending an email from backend shows this error:

Code:

Error: Call to a member function getDebug() on int in src/XF/Admin/Controller/ToolsController.php at line 318
XF\Admin\Controller\ToolsController->actionTestEmail() in src/XF/Mvc/Dispatcher.php at line 362
XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 264
XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 121...

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