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)