GLTFLoader Cannot read properties of undefined (reading 'traverse')

Questions
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1

Hi boys!

in this case , group throw type error of traverse.

error

code: three-codesandBox

thank you.

2

Most of them are normal, and a small number of them will have this problem。

3 
  gltf.scene.traverse((i) => {
    scene.add(i);
  });

Does the error go away if you just do this:

scene.add( gltf.scene );
4

I need to modify their material :sob: