My game just crashed, I assume this is where I put the crash log

[xX69HotSausage69Xx]

Running on 64 bit Windows with 16 GB RAM 
Version: v1.12.4 (Stable)22/02/2020 12:42:18: Critical error occurred
System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at Vintagestory.GameContent.BlockEntityAnvil.OnUpset(Vec3i voxelPos, BlockFacing towardsFace)
   at Vintagestory.GameContent.BlockEntityAnvil.OnUseOver(IPlayer byPlayer, Vec3i voxelPos, BlockSelection blockSel)
   at Vintagestory.GameContent.ItemHammer.OnHeldAttackStop(Single secondsPassed, ItemSlot slot, EntityAgent byEntity, BlockSelection blockSel, EntitySelection entitySel)
   at _h35g4FfdND4HjYmpzHySXO6WjXq._FxlqD1qEcfwerUTYFswSwN8FtuT()
   at Vintagestory.Common.EventManager.TriggerGameTick(Int64 ellapsedMilliseconds, IWorldAccessor world)
   at _RH2yUybUikKm1ExPZxrALgNaKFn._91TZqG1qJCMXdG8VQZoZrbfuXkA(Single )
   at _RH2yUybUikKm1ExPZxrALgNaKFn._L4pbuONXeSJprGj3ZbPDmoadD4V(Single )
   at _Er4CEgyFFxIGQTBVNdsxY0AGyaIB._BPr8ks5b3mzoERoFzBinGEQ6TWf(Single )
   at _EQxWmablZ9e1a2ttf5sknNEhthE._l9ByZEMecR7t7QvrEygLSVEPA7G(Single )
   at _EQxWmablZ9e1a2ttf5sknNEhthE._wVES3I4AcneyUTHpdRuLu6EHvCH(Single )
   at Vintagestory.Client.NoObf.ClientPlatformWindows.window_RenderFrame(Object sender, FrameEventArgs e)
   at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   at OpenTK.GameWindow.RaiseRenderFrame(Double elapsed, Double& timestamp)
   at OpenTK.GameWindow.DispatchRenderFrame()
   at OpenTK.GameWindow.Run(Double updates_per_second, Double frames_per_second)
   at _KgkCdVM1WnzOB8EQZYjMqMgiQif._FmdhOaaNJf4xNNi98fb5q9puBYb(_vzXUYcAd8hQnBWAaPoIw4RI2yoU , String[] )
   at _RenJRmDtixD6Tekd8S9clc9cPZV._FmdhOaaNJf4xNNi98fb5q9puBYb(ThreadStart )
-------------------------------
 

[Tyron]

Thanks for the report, this is already fixed in the upcoming version. Until then, you can work around the bug by not getting close to the block boundaries when smithing.

[xX69HotSausage69Xx]

Thank you for the response, I'll keep that in mind!