U20特别版在第二关频繁跳出，求解决方法

loboxue

四五次了，跳出的地方还都不一样，没有规律性，错误代码如下，求解决方法，跪谢。
Version: 1.3.6.0
Thread: LogicThread
System.ArgumentException: Pathfinding, start position is NaN!
   at Magicka.PathFinding.NavMesh.FindPath(Vector3& iStartPos, Vector3& iEndPos, List`1 iPath, MovementProperties iMoveAbilities)
   at Magicka.PathFinding.NavMesh.FindShortestPath(Vector3& iStartPos, Vector3& iEndPos, List`1 iPath, MovementProperties iMoveAbilities)
   at Magicka.AI.AgentStates.AIStateMove.OnEnter(IAI iOwner)
   at Magicka.GameLogic.Entities.Avatar.PushState(IAIState iNewState)
   at Magicka.AI.AgentStates.AIStateIdle.OnExecute(IAI iOwner, Single iDeltaTime)
   at Magicka.GameLogic.Entities.Avatar.Update(DataChannel iDataChannel, Single iDeltaTime)
   at Magicka.GameLogic.Entities.EntityManager.Update(DataChannel iDataChannel, Single iDeltaTime, Int32 iStartIndex, Int32 iEndIndex)
   at Magicka.GameLogic.GameStates.PlayState.UpdateEntitiesA()
   at Magicka.GameLogic.GameStates.PlayState.Update(DataChannel iDataChannel, Single iDeltaTime)
   at Magicka.GameLogic.GameStates.GameStateManager.Update(DataChannel iDataChannel, Single iDeltaTime)
   at Magicka.Game.Update(Single iDeltaTime)
   at Magicka.Game.ThreadedUpdate()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()