How do I solve the error

Index was out of range. Must be non-negative and less than the size of the collection

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

public class DrawLine : MonoBehaviour
{
    public GameObject linePrefab;
    public GameObject currentLine;

    //public LineRenderer OriginalLine;

    public LineRenderer lineRenderer;
    public List<Vector2> fingrePositions;

    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if(Physics.Raycast(ray, out hit))
            {
                Debug.Log("hit.transform.name");

                if(hit.transform.name == "EmpetySpace")
                {
                    CreateLine();
                }
            }
        }

        if (Input.GetMouseButton(0))
        {
            Vector2 tempFingerPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            if (Vector2.Distance(tempFingerPos, fingrePositions[fingrePositions.Count - 1]) > 0.1f)
            {
                UpdateLine(tempFingerPos);
            }
        }

        if (Input.GetMouseButtonUp(0))
        {
            enabled = false;
        }
    }

    void CreateLine()
    {
        currentLine = Instantiate(linePrefab, Vector3.zero, Quaternion.identity);
        lineRenderer = currentLine.GetComponent<LineRenderer>();
        fingrePositions.Clear();
        fingrePositions.Add(Camera.main.ScreenToWorldPoint(Input.mousePosition));
        fingrePositions.Add(Camera.main.ScreenToWorldPoint(Input.mousePosition));
        lineRenderer.SetPosition(0, fingrePositions[0]);
        lineRenderer.SetPosition(1, fingrePositions[1]);
    }

    void UpdateLine(Vector3 newFingerPos)
    {
        fingrePositions.Add(newFingerPos);
        lineRenderer.positionCount++;
        lineRenderer.SetPosition(lineRenderer.positionCount - 1, newFingerPos);
    }
}

if i press on a gameObject then the code works perfectly fine. But when i click anywhere on the screen other than the gameObject then this error appears