Adding a singleton script to 2 objects makes one of them dissapear.

I have added this code :

 public class Singleton : MonoBehaviour
 {
     public static Singleton inst;
     // Start is called before the first frame update
     private void Awake()
     {
         if (Singleton.inst == null)
         {
             Singleton.inst = this;
             DontDestroyOnLoad(gameObject);
         }
         else
         {
             Destroy(gameObject);
                 
         }
         
     
     }
 }

I have tried to have other classes and scripts inherit from Singleton in order to apply the dontdestroyonload to the object they are attached to. But the same error happens. I m using singleton to keep the player, and the inventory with all the items.