FramerJS animation glitch

newLayer = new Layer
    x: 320, y: 600, backgroundColor:"white", width: 200, height: 150

newAnimation = new Animation
    layer: newLayer
    properties:
        rotationZ: 360
    time: 5
    repeat: 10000

newAnimationFast = new Animation
    layer: newLayer
    properties:
        rotationZ: 360
    time: 0.5
    repeat: 10000

fast = false
newAnimation.start()
newLayer.on Events.Click, ->
    if !fast
        print "Fast!"
        newAnimation.stop()
        newAnimationFast.start()
        fast = true
    else if fast
        print "Slow!"
        newAnimationFast.stop()
        newAnimation.start()
        fast = false