XF 2.3 Error - Attempt to read property "thread_id" on null

[SelamT]

Hello,

From the admin panel, I get the following error when restructuring threads. I have disabled all add-ons etc. but I can't get past this part.
I would like your support for the solution.

ErrorException: [E_WARNING] Attempt to read property "thread_id" on null in src/XF/ThreadType/QuestionHandler.php at line 499

    XF::handlePhpError() in src/XF/ThreadType/QuestionHandler.php at line 499
    XF\ThreadType\QuestionHandler->onThreadRebuildCounters() in src/XF/Entity/Thread.php at line 876
    XF\Entity\Thread->rebuildCounters() in src/XF/Job/Thread.php at line 37
    XF\Job\Thread->rebuildById() in src/XF/Job/AbstractRebuildJob.php at line 42
    XF\Job\AbstractRebuildJob->run() in src/XF/Job/Manager.php at line 275
    XF\Job\Manager->runJobInternal() in src/XF/Job/Manager.php at line 205
    XF\Job\Manager->runJobEntry() in src/XF/Job/Manager.php at line 121
    XF\Job\Manager->runByIds() in src/XF/Admin/Controller/ToolsController.php at line 146
    XF\Admin\Controller\ToolsController->actionRunJob() in src/XF/Mvc/Dispatcher.php at line 362
    XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 265
    XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 121
    XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 63
    XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2813
    XF\App->run() in src/XF.php at line 802
    XF::runApp() in admin.php at line 15

Thanks,