baum node not return json

I used Baum node in my Laravel project. I have this code:

  public function index(){

    $rootTag = Tag::root()->children()->get();

    return response()->json($rootTag, 200);
 }

but it always crashed, when it is executed. There is endless loading and nothing is displayed on screen.I dont know why. When I tried to add this code:

dd($rootTag)

it is work fine. However, problem is, when I want json like output. What can be the problem ?

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