求助弹红字

A20玩着玩着就疯狂弹红字，NullReferenceException: Object reference not set to an instance of an object

有没有大佬帮忙看一下红字日志啊

NullReferenceException: Object reference not set to an instance of an object

  at EntityGroups.GetRandomFromGroupList (System.Collections.Generic.List`1[T] grpList, GameRandom random) [0x00047] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at EntityGroups.GetRandomFromGroup (System.String _sEntityGroupName, System.Int32& lastClassId, GameRandom random) [0x00026] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at AIWanderingHordeSpawner.UpdateSpawn (World _world, System.Single _deltaTime) [0x0007c] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at AIWanderingHordeSpawner.Update (World world, System.Single _deltaTime) [0x00032] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at AIDirectorWanderingHordeComponent.TickActiveSpawns (System.Single dt) [0x00027] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at AIDirectorWanderingHordeComponent.Tick (System.Double _dt) [0x00010] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at AIDirector.ComponentsTick (System.Double _dt) [0x00015] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at AIDirector.Tick (System.Double dt) [0x00000] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at World.OnUpdateTick (System.Single _partialTicks, System.ArraySegment`1[T] _activeChunks) [0x00238] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at GameManager.UpdateTick () [0x00073] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at GameManager.gmUpdate () [0x00305] in <d885d5e5cbd941a78c268f40cc2ae744>:0 

  at GameManager.Update () [0x00000] in <d885d5e5cbd941a78c268f40cc2ae744>:0