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

I get the NullReferenceException: Object reference not set to an instance of an object error at the moment and can not seem to find out why.

It says the problem is with this code:

 if (bullet)
     {
         Instantiate(bullet,bulletSpawn.transform.position, bulletSpawn.tranform.rotation);
         waitTillNextFire = 1;
     }

Here is how I declared them:

 var waitTillNextFire : float = 0;
 var bullet : GameObject;
 var bulletSpawn : GameObject;

And I have also put in the objects in the inspector as shown here:

Here's the whole script :)

 var CameraObject : GameObject;
 @HideInInspector
 var targetXRotation : float;
 @HideInInspector
 var targetYRotation : float;
 @HideInInspector
 var targetXRotationV : float;
 @HideInInspector
 var targetYRotationV : float;
 
 var rotateSpeed : float = 0.3;
 
 var holdHeight : float = -0.5;
 var holdSide : float = 0.5;
 
 var ratioHipHold : float = 1;
 var hipToAimSpeed : float = 0.1;
 @HideInInspector
 var ratioHipHoldV : float = 1;
 
 var fireSpeed : float = 15;
 @HideInInspector
 var waitTillNextFire : float = 0;
 var bulletSpawn : GameObject;
 var bullet : GameObject;
 
 
 function Update ()
 {
     
     if (Input.GetButton("Fire1"))
     {
         if (waitTillNextFire <= 0)
         {
             if (bullet)
             {
                 Instantiate(bullet,bulletSpawn.transform.position, bulletSpawn.tranform.rotation);
                 waitTillNextFire = 1;
             }
         }
     }
         
         waitTillNextFire -= Time.deltaTime * fireSpeed;
         
         
         if (Input.GetButton("Fire2"))
         ratioHipHold = Mathf.SmoothDamp(ratioHipHold, 0, ratioHipHoldV, hipToAimSpeed);
         if (Input.GetButton("Fire2") == false)
         ratioHipHold = Mathf.SmoothDamp(ratioHipHold, 1, ratioHipHoldV, hipToAimSpeed);
         
         
         transform.position = CameraObject.transform.position + (Quaternion.Euler(0,targetYRotation,0) * Vector3(holdSide * ratioHipHold, holdHeight * ratioHipHold, 1));
         
         
         targetXRotation = Mathf.SmoothDamp( targetXRotation, CameraObject.GetComponent(MouseLookScript).xRotation, targetXRotationV, rotateSpeed);
         targetYRotation = Mathf.SmoothDamp( targetYRotation, CameraObject.GetComponent(MouseLookScript).yRotation, targetYRotationV, rotateSpeed);
         transform.rotation = Quaternion.Euler(targetXRotation, targetYRotation, 0);
 }