Error, and I cannot figure out how to remove it

NullReferenceException: Object reference not set to an instance of an object GameOverResults.OnGUI () (at Assets/Scripts/GameOverResults.cs:12)

   public class GameOverResults : MonoBehaviour {
     
     public void OnGUI() {
 
         //find score variablen fra handattack
         GameObject eHand = GameObject.Find ("Hand");
         handAttack gHand = eHand.GetComponent<handAttack> ();
         string FinalScore = string.Format("{0}", gHand.theScore);
 
         //find time variablen fra guitimer
         GameObject eTime = GameObject.Find ("Plate");
         guiTimer gTime = eTime.GetComponent<guiTimer> ();
 
         string Finalminutes = Mathf.Floor(gTime.timer / 60).ToString("00");
         string Finalseconds = Mathf.Floor(gTime.timer % 60).ToString("00");
         
         string FinalTime = string.Format("Tid {0:0}:{1:00}", Finalminutes, Finalseconds);
 
         GUI.Label(new Rect(595, 8, 20, 20), FinalScore);
         GUI.Label(new Rect(605, 8, 20, 20),  FinalTime);
     }
 }