Model loading error: "Cannot read field "size" because "group" is null"

[dar-dev]

Error when splitting meshes.
Here's the model : https://drive.google.com/file/d/1HEk7R5EKQcDayoLJlZQqq0vjZ4cfs4_q/view?usp=share_link

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Stack trace :

Caused by: java.lang.NullPointerException: Cannot read field "size" because "group" is null
at net.mgsx.gltf.loaders.shared.geometry.MeshSpliter.split(MeshSpliter.java:144)
at net.mgsx.gltf.loaders.shared.geometry.MeshLoader.load(MeshLoader.java:417)
at net.mgsx.gltf.loaders.shared.GLTFLoaderBase.getNode(GLTFLoaderBase.java:314)
at net.mgsx.gltf.loaders.shared.GLTFLoaderBase.loadScene(GLTFLoaderBase.java:234)
at net.mgsx.gltf.loaders.shared.GLTFLoaderBase.loadScenes(GLTFLoaderBase.java:213)
at net.mgsx.gltf.loaders.shared.GLTFLoaderBase.load(GLTFLoaderBase.java:154)
at net.mgsx.gltf.loaders.gltf.GLTFAssetLoader.loadSync(GLTFAssetLoader.java:142)
at net.mgsx.gltf.loaders.gltf.GLTFAssetLoader.loadSync(GLTFAssetLoader.java:27)
at com.badlogic.gdx.assets.AssetLoadingTask.handleAsyncLoader(AssetLoadingTask.java:128)
at com.badlogic.gdx.assets.AssetLoadingTask.update(AssetLoadingTask.java:91)
at com.badlogic.gdx.assets.AssetManager.updateTask(AssetManager.java:575)
at com.badlogic.gdx.assets.AssetManager.update(AssetManager.java:424)
... 9 more