Shooting bullets with Instantiate function

Hey guys. I'm trying to shoot a bullet, and I somehow managed to do it. But now I added a shop script, and it doesn't shoot anything. Do you see anything wrong? The script itself doesn't have an error.

public class BulletGenerator : MonoBehaviour { public GameObject BulletPrefab; public static BulletGenerator instance; private ShopScript shop; private List stat = new List(); public int capacity = 15; public int mags = 12; public float FireRate = 10; public float lastfired; void Awake() { if (instance == null) { instance = this; }

 }
 void Start () {
     shop = ShopScript.instance;
     stat = shop.enabled;
 }
 
 // Update is called once per frame
 void Update ()
 {
     NewMethod();
     if (stat[1] == true) {
         mags += 7;
         stat[1] = false;
         stat[1] = shop.enabled[1];
     }
 }

 private void NewMethod()
 {
     if (stat[6] == true)
     {
         if (Input.GetMouseButton(0))
         {
             if (Time.time - lastfired > 1 / FireRate)
             {
                 lastfired = Time.time;
                 shootFunction();
             }
         }
     }
     else
     {
         if (Input.GetMouseButtonDown(0))
         {
             shootFunction();
         }
     }
 }

 IEnumerator shootFunction() {
     if (Input.GetMouseButtonDown(0))
     {
         if (capacity < 1)
         {
             yield return new WaitForSeconds(2f);
             if (stat[2] == true)
             {
                 capacity = 30;
             }
             else {
                 capacity = 15;
             }
             mags -= 1;
         }
         else {
             if (mags < 0)
             {

             }
             else {
                 Instantiate(BulletPrefab, transform.position, transform.rotation);
                 capacity -= 1;
             }
         }

     }
 }

}