Spawn Gameobject when its not at the position?

Hello,

i don´t know how to check if the gameobject is already there?

This is my script for spawning the gameobject:

// The object to be spawned 
   var SpawnObject : GameObject; 
   
   // in seconds 
   var SpawnStartDelay : float = 0; 
   var SpawnRate: float = 120.0; 
   
   function Start() 
   {
       InvokeRepeating("Spawn", SpawnStartDelay, SpawnRate); 
   } 
   
   // Spawn the SpawnObject 
   function Spawn() 
   {
       Instantiate(SpawnObject, transform.position, transform.rotation); 
   }

How can i improve the scrip, that it only spawns the object when the gameobject is not there, but when it´s there that i doesn´t spawn the gameobject?

Thanks:)

anyone can help me?