Button Interactions problem

Select, Update, Insert, and Delete is tagged as UI
while Akira, Kiel, Kuro, Helper 1, and Helper 2 is tagged as Buttons

Here's how it works when either select, or Delete is pressed anything that tagged in UI is disabled or not interactable while Buttons are interactable
When one of them is pressed the UI is enabled and the Buttons is disabled


The problem is whenever I press select or delete I get this error.


Here's the code

Code (CSharp):

1. bool[] spawns = {true, true, true, false, false};
2. int count = 1;
3. private bool cooldown = false;
4.  
5. public void select()
6.     {
7.         Button[] chars = { GameObject.Find("Akira").GetComponent<UnityEngine.UI.Button>(),
8.                            GameObject.Find("Kiel").GetComponent<UnityEngine.UI.Button>(),
9.                            GameObject.Find("Kuro").GetComponent<UnityEngine.UI.Button>(),
10.                            GameObject.Find("Helper 1").GetComponent<UnityEngine.UI.Button>(),
11.                            GameObject.Find("Helper 2").GetComponent<UnityEngine.UI.Button>()
12.                             };
13.         if (count == 1) {
14.             count = 2;
15.             for (int x = 0; x < chars.Length; x++)
16.             {
17.                 if (spawns[x] == true)
18.                 {
19.                     chars[x].GetComponent<Button>().interactable = true;
20.                 }
21.                 else if (spawns[x] == false)
22.                 {
23.                     chars[x].GetComponent<Button>().interactable = false;
24.                 }
25.             }
26.             cooldown = false;
27.         }
28.     }

Edit: I tried removing Akira from the equation and it works normally

 

Update: Deleted the button and copied the other ones and changed it to the recent one and worked