Trying to compare an input field with an int

Hello

I am building an education game and in the current scene, I am working on I am trying to use an input field as a way for the user to answer the prompt. Currently, I am able to calculate the answer in a separate script and return that as an int. I want to know how to compare that answer with the input field which I am currently saving in another script. Here is the code I have written. I am getting a NullReferenceException: Object reference not set to an instance of an object GetInputOnClick.GetInputOnclick () (at Assets/Scripts/GetInputOnClick.cs:28)

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI;

public class GetInputOnClick : MonoBehaviour {

 //public Button btn;
 public InputField inputText;
 int text;
 public Button btn;
 private GameObject answer;
 private int submittedAnswer;

 private void Start()
 {
     btn.onClick.AddListener(GetInputOnclick);
     answer = GameObject.Find("Answer Input");
 }

 public void GetInputOnclick()
 {
     text = int.Parse(inputText.text);
     Debug.Log(text);
     SolutionForMath solution = answer.GetComponent<SolutionForMath>();
    
     submittedAnswer = solution.answer;

     if (text == submittedAnswer)
     {
         Debug.Log("correct");
     }

     else
     {
         Debug.Log("incorrect");
     }

     


 }

 void CompareAnswer()
 {
     
 }

}