V4 Babylon crashes, when manipulating a animationGroup in the Inspector

This is from the docs: https://www.babylonjs-playground.com/#CBGEQX#1
Start the animation. Go into the inspector. Set the speed ratio to 0 and then change the current frame.

babylon.js:16 Uncaught TypeError: Cannot read property 'frame' of undefined
    at e._interpolate (babylon.js:16)
    at e._interpolate (babylon.js:16)
    at e.animate (babylon.js:16)
    at e._animate (babylon.js:16)
    at t.H.a._animate (babylon.js:16)
    at t.render (babylon.js:16)
    at index.js:601
    at e._renderLoop (babylon.js:16)

Good catch :slight_smile:
I’ll fix that right now

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