error during the game

[Cricus]

Running on 64 bit Windows with 8 GB RAM 
Version: 1.8.0-rc.1 Survival Mode Edition (Unstable)15/12/2018 11:49:30: Critical error occurred
System.IndexOutOfRangeException: Indice oltre i limiti della matrice.
   in Vintagestory.API.Common.ClientAnimator.calculateMatrices(Single dt)
   in Vintagestory.API.Common.AnimatorBase.OnFrame(Dictionary`2 activeAnimationsByAnimCode, Single dt)
   in Vintagestory.API.Common.AnimationManager.OnClientTick(Single dt)
   in _8akMr3ddwKGB76rdmK0Fx1tSgns._cxGAXb9cxNncHOCldVBm6urR9xNA(EnumRenderStage , Single )
   in _uvKGIQb0gYxyaNlMKJjm7rS4iC._cxGAXb9cxNncHOCldVBm6urR9xNA(EnumRenderStage , Single )
   in _uvKGIQb0gYxyaNlMKJjm7rS4iC._x7NvMDcJh1AbECtAkbsHfRbBvf6A(Single )
   in _uvKGIQb0gYxyaNlMKJjm7rS4iC._bceFfPiiFyJcj6Do9umNIPS3L4B(Single )
   in _crwNHX3aLkwItsxxsSUwFDfLTkO._jKfHWSaA9eiBy6RpjqE55m0Ei8n(Single )
   in _qRmlgLQZ1OyaMMIKAo1mMvpfdPM._IeWNhgrQXFMlCyCICEEJaw81V8t(Single )
   in _qRmlgLQZ1OyaMMIKAo1mMvpfdPM._P6Ybwf1slvh2lxrk707F2KfyBwN(Single )
   in _Z5kRz3NOtXL8upC9whsAeI8Lx7r._FLgH1Ag5xFVvQLMEI1mzDZDyePC(Object , FrameEventArgs )
   in System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   in OpenTK.GameWindow.RaiseRenderFrame(Double elapsed, Double& timestamp)
   in OpenTK.GameWindow.DispatchRenderFrame()
   in OpenTK.GameWindow.Run(Double updates_per_second, Double frames_per_second)
   in _hP6gnpvaqvdYD3qmaiOswnK02Yr._hsbPpjAoNJrdZhFanM9RsTU3xqk(_URBtiEwX9vTE4zzssShJ9mim4Rc , String[] )
   in _ljwl5tGblWloUU2SibW97syEfP._hsbPpjAoNJrdZhFanM9RsTU3xqk(ThreadStart )
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[Tyron]

Oh wow, what an unexpected place for it to crash. Thank you for the report! I will add some code to help me track down this issue.