SceneCamera NAN persisting problem

Hey,

In our porject now we keep getting this error

transform.rotation assign attempt for 'SceneCamera' is not valid. Input rotation is { NaN, NaN, NaN, NaN }. UnityEditor.DockArea:OnGUI()

I know how to get rid of it, by either cloesing and reopning the sceneview or going to window->Layouts->Revert Factory Settings... Though it comes back everytime we play our scene. Does anyone have any clue to what it is that creates this error? Is there anything that is known to generate this error?

Kind Regards Alex

Edit:

I have figured out which script that is causing the problems.. If I remove it from the scene everything works fine and I don't get the SceneCamera error. But the script is so basic that I can't see how it would generate this error..

 using UnityEngine;
 using System.Collections;
 
 public class CloudScriptHandler : MonoBehaviour {
 
     public GameObject[] listOfClouds;
     public Vector2 spawnTimeRandomSeeds;
     public Vector2 cloudSpeedRandomSeeds;
 
     public Vector3 positionMax;
 
     public Vector3 positionMin;
 
     float spawnTimer;
     float timeToSpawn;
 
     // Use this for initialization
     void Start () 
     {
         timeToSpawn = Random.Range(spawnTimeRandomSeeds.x,spawnTimeRandomSeeds.y);
 
     }
 
     // Update is called once per frame
     void Update () 
     {
         spawnTimer += Time.deltaTime;
 
         if( spawnTimer >= timeToSpawn )
         {
             CreateNewCloud();
             timeToSpawn = Random.Range(spawnTimeRandomSeeds.x,spawnTimeRandomSeeds.y);
             spawnTimer = 0.0f;
         }
 
     }
 
     void CreateNewCloud()
     {
         int maxRand = listOfClouds.Length - 1;
         int randCloud = Random.Range( 0,  maxRand );
         GameObject clone;
         clone = Instantiate( listOfClouds[randCloud], CalculatePosition(), Quaternion.identity) as GameObject;
         clone.transform.parent = gameObject.transform;
 
         clone.GetComponent<CloudScript>().cloudSpeed = Random.Range(cloudSpeedRandomSeeds.x, cloudSpeedRandomSeeds.y );
     }
 
     Vector3 CalculatePosition()
     {
         Vector3 newPosition = new Vector3();
 
         newPosition.x = Random.Range( positionMin.x, positionMax.x );
         newPosition.y = Random.Range( positionMin.y, positionMax.y );
         newPosition.z = Random.Range( positionMin.z, positionMin.z );
 
         return newPosition; 
     }
 }
 
 using UnityEngine;
 using System.Collections;
 
 public class CloudScript : MonoBehaviour {
 
     public float cloudSpeed = 1.0f;
 
     // Use this for initialization
     void Start () {
 
     }
 
     // Update is called once per frame
     void Update ()
     {
 
         Vector3 newPosition = gameObject.transform.position;
         newPosition.x -= Time.deltaTime * cloudSpeed;
         gameObject.transform.position = newPosition;
 
         if( newPosition.x <= -200 )
         {
             Destroy( this.gameObject );
         }
     }
 }