SV Error - crash instead of save

Message: Object reference not set to an instance of an object.
InnerException:
Stack Trace:    at StardewValley.FarmAnimal.dayUpdate(GameLocation environtment)
   at StardewValley.AnimalHouse.DayUpdate(Int32 dayOfMonth)
   at StardewValley.Buildings.Building.dayUpdate(Int32 dayOfMonth)
   at StardewValley.Buildings.Coop.dayUpdate(Int32 dayOfMonth)
   at StardewValley.Locations.BuildableGameLocation.DayUpdate(Int32 dayOfMonth)
   at StardewValley.Farm.DayUpdate(Int32 dayOfMonth)
   at StardewValley.Game1.newDayAfterFade()
   at StardewValley.Game1.UpdateOther(GameTime time)
   at StardewValley.Game1.Update(GameTime gameTime)
   at Microsoft.Xna.Framework.Game.Tick()
   at Microsoft.Xna.Framework.Game.HostIdle(Object sender, EventArgs e)
   at Microsoft.Xna.Framework.GameHost.OnIdle()
   at Microsoft.Xna.Framework.WindowsGameHost.RunOneFrame()
   at Microsoft.Xna.Framework.WindowsGameHost.ApplicationIdle(Object sender, EventArgs e)
   at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at Microsoft.Xna.Framework.WindowsGameHost.Run()
   at Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun)
   at StardewValley.Program.Main(String[] args)