Error - Attempt to read property "thread_id" on null

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.

Code:

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...

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