Trying to assign UI images from an array with scriptable objects not working?

So I am making an armor system, and so when the player equips a new peice of armor, it goes into the public armor array that can be acessed anywhere. In order to show it visually, I made a script that should always be setting each respective 'box' in your inventory to that armor peice to show you have equiped it... but of course Im getting an error that says object refrence not set to an instance of an object. Im not sure what isn't defined here.. the aray is full of scriptable 'items' that have an icon, and I know that it can work because without all the if else statements, I tried setting it manually and the image changed correctly, but it still gave me an error despite working fine. I am very confused. Any ideas?

Here is the script that manages the UI of the armor:

 public Image Head;
 public Image Body;
 public Image Legs;
 public Image Charm;
 //public Image Weapon;
 public Image tets;

 EquipmentManager equipManager;
 

 void Start()
 {
     equipManager = EquipmentManager.instance;
 }

 void Update()
 {

     if (equipManager.currentEquipment[0].icon != null)
     {
         Head.enabled = true;
         Head.sprite = equipManager.currentEquipment[0].icon;
     }
     else
     {
         Head.enabled = false;
     }

     if (equipManager.currentEquipment[1].icon != null)
     {
         Body.enabled = true;
         Body.sprite = equipManager.currentEquipment[1].icon;
     }
     else
     {
         Body.enabled = false;
     }
     if (equipManager.currentEquipment[2].icon != null)
     {
         Legs.enabled = true;
         Legs.sprite = equipManager.currentEquipment[2].icon;
     }
     else
     {
         Legs.enabled = false;
     }
     if (equipManager.currentEquipment[4].icon != null)
     {
         Charm.enabled = true;
         Charm.sprite = equipManager.currentEquipment[4].icon;
     }
     else
     {
         Charm.enabled = false;
     }

 }

Here is the script with the equipment array in it:

 #region singleton
 public static EquipmentManager instance;

 void Awake()
 {
     instance = this;
 }

 #endregion


 public Equipment[] currentEquipment;



 Inventory inventory;

 void Start()
 {
     inventory = Inventory.instance;

     int numSlots = System.Enum.GetNames(typeof(EquipmentSlot)).Length;
     currentEquipment = new Equipment[numSlots];

 }

 public void Equip(Equipment newItem)
 {
     int slotIndex = (int)newItem.equipSlot;

     Equipment oldItem = null;


     if(currentEquipment[slotIndex] != null)
     {
         oldItem = currentEquipment[slotIndex];
         inventory.Add(oldItem);
     }

     currentEquipment[slotIndex] = newItem;
 }

}