为什么我有时候摧毁建筑的时候一直跳出啊？？求告知

万念咀灰

每次跳出目录都会产生个errorreport文本：
Version: 1.0.3.1
Thread: Main

System.NullReferenceException: 未将对象引用设置到对象的实例。
   在 Reus.Model.Mines.CivStatActivationRequirement.GetCurrentValue(Civilization owner)
   在 Reus.Model.Mines.CivStatActivationRequirement.CouldActivate(MineAsset mine)
   在 Reus.Model.Mines.CivStatActivationRequirement.CivStatActivationListener.OnValueChanged(Object sender, PropertyChangedEventArgs`1 e)
   在 System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   在 Reus.Model.PropertyChangedEventCollection`1.InvokePropertyChanged(Object sender, T property, PropertyChangedEventArgs`1 args)
   在 Reus.Model.Civilizations.Civilization.set_Wealth(Single value)
   在 Reus.Controller.Civilizations.Growth.Tick(GameTime gameTime)
   在 Reus.Controller.StepController.Update(GameTime gameTime)
   在 Reus.Controller.Civilizations.Government.UpdateCivilization(CivilizationControl civControl, GameTime gameTime)
   在 Reus.Controller.Civilizations.Government.<>c__DisplayClass5.<Update>b__4(CivilizationControl cc)
   在 System.Collections.Generic.List`1.ForEach(Action`1 action)
   在 Reus.Controller.Civilizations.Government.Update(GameTime gameTime)
   在 Reus.Controller.PlanetController.Update(GameTime gameTime)
   在 Reus.GameplayComponent.Update(GameTime gameTime)
   在 Microsoft.Xna.Framework.Game.Update(GameTime gameTime)
   在 (Object , GameTime )
   在 冷櫎띂ફ迷ಏ泈.ウ沊鉨㚽ᕼ᠃ᮩ(Object , GameTime 볤샑辋䴠簹連夯촵)
   在 ≬鑜瓜쓄憎쨢㣠㭄.Update(GameTime gameTime)
   在 Microsoft.Xna.Framework.Game.Tick()
   在 Microsoft.Xna.Framework.Game.HostIdle(Object sender, EventArgs e)
   在 Microsoft.Xna.Framework.GameHost.OnIdle()
   在 Microsoft.Xna.Framework.WindowsGameHost.RunOneFrame()
   在 Microsoft.Xna.Framework.WindowsGameHost.ApplicationIdle(Object sender, EventArgs e)
   在 System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
   在 System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   在 System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   在 System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   在 System.Windows.Forms.Application.Run(Form mainForm)
   在 Microsoft.Xna.Framework.WindowsGameHost.Run()
   在 Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun)
   在 (Object )
   在 絕㲝�陼ﱾㆺ݃.䅾∮吒赐⻪엞束(Object )
   在 弛㻗惦汓糳侏㚼.抏﬷녥풞븴矫()
   在 弛㻗惦汓糳侏㚼.눵萩타ഠ颜ᇕ粐螾(String[] 嗕䛍봛ミ莏㵇꠶⹅)

0x0000 Reus.exe->ꂈ姹틌躤韃.₁땊뇔틶⎐⨥⟂ಶ
0x01b8 Reus.exe->弛㻗惦汓糳侏㚼.뀆悀潴┈Ꮝ碂�
0x0007 Reus.Model.dll->Reus.Model.Mines.CivStatActivationRequirement.GetCurrentValue
0x0000 Reus.Model.dll->Reus.Model.Mines.CivStatActivationRequirement.CouldActivate
0x0000 Reus.Model.dll->Reus.Model.Mines.CivStatActivationRequirement+CivStatActivationListener.OnValueChanged
0xffffffff CommonLanguageRuntimeLibrary->System.EventHandler`1.Invoke
0x0018 Reus.Model.dll->Reus.Model.PropertyChangedEventCollection`1.InvokePropertyChanged
0x0019 Reus.Model.dll->Reus.Model.Civilizations.Civilization.set_Wealth
0x0266 Reus.exe->Reus.Controller.Civilizations.Growth.Tick
0x005e Reus.exe->Reus.Controller.StepController.Update
0x0051 Reus.exe->Reus.Controller.Civilizations.Government.UpdateCivilization
0x0012 Reus.exe->Reus.Controller.Civilizations.Government+<>c__DisplayClass5.<Update>b__4
0x0036 CommonLanguageRuntimeLibrary->System.Collections.Generic.List`1.ForEach
0x003c Reus.exe->Reus.Controller.Civilizations.Government.Update
0x00f2 Reus.exe->Reus.Controller.PlanetController.Update
0x008e Reus.exe->Reus.GameplayComponent.Update
0x0058 Microsoft.Xna.Framework.Game.dll->Microsoft.Xna.Framework.Game.Update