Bear glTF model could not display

I tried to display the following model in Sketchfab with Babylon.js.

https://sketchfab.com/models/f2f13a8630004b1c82730d8b9ffa0e1f

bear_on_balloons\scene.gltf

However, when trying to display with Babylon.js sandbox, an error was output to the console and it was not possible to display the glTF model. It seems there is a problem with animation processing.

https://sandbox.babylonjs.com/

BJS - [00:09:49]: Babylon.js engine (v3.1-beta-6) launched
Babylon.js:formatted:28342

Uncaught TypeError: Cannot read property 'frame' of undefined
    at t._interpolate (babylon.js:formatted:28342)
    at t.animate (babylon.js:formatted:28528)
    at t._animate (babylon.js:formatted:28682)
    at i._animate (babylon.js:formatted:14035)
    at i.render (babylon.js:formatted:14758)
    at t.renderFunction (babylon.js:formatted:37709)
    at babylon.js:formatted:37796
    at n._renderLoop (babylon.js:formatted:6672)