Unity crash if i go to editor in play mode

Questions & Answers
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1

Sorry for my bad English. This error from my object, because if it dont exist in scene unity work fine. When i enter play mode everything okay, but if i dont stop play mode and go to the scene editor, after 2 seconds unity freeze, and i need from task manager end unity task.
Code from my object:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
using UnityEngine.Playables;
using Random = UnityEngine.Random;

public class VisitorScript : MonoBehaviour
{
    [SerializeField]
    List<int> productsBuy = new List<int>();
    [SerializeField]
    List<GameObject> shelfs = new List<GameObject>();
    [SerializeField]
    List<GameObject> shelfsWithNeedProducts = new List<GameObject>();
    [SerializeField]
    List<int> productsNeedToBuy = new List<int>();

    Transform currentShelf;

    List<int> productsInCart = new List<int>();

    public bool isGo = false;
    public bool endShopping = false;

    public GameObject MainShelfs;
    public GameObject productManager;

    public GameObject exit;
    public GameObject kashier;

    private Animator animator;

    private NavMeshAgent agent;

    private void Awake()
    {
        agent = GetComponent<NavMeshAgent>();
        animator = GetComponent<Animator>();
        productManager = GameObject.Find("ProductManager");
        MainShelfs = GameObject.FindWithTag("mainShelfs");
        kashier = GameObject.FindWithTag("Cashier");
        exit = GameObject.FindWithTag("Exit");
    }

    public IEnumerator visitorCoroutine()
    {
        while (true)
        {
            if (shelfsWithNeedProducts.Count > 0)
            {
                goToShelf(shelfsWithNeedProducts[0].transform);
                currentShelf = shelfsWithNeedProducts[0].transform;
            }
            else if (productsInCart.Count > 0) { agent.SetDestination(new Vector3(kashier.transform.position.x, kashier.transform.position.y, kashier.transform.position.z)); }


            if (agent.remainingDistance > 1f) { continue; }
            else {
                isGo = false;
                yield return new WaitForSeconds(Random.Range(5, 9));
                if(currentShelf.Find("shelftrigger").GetComponent<shelfScript>().count > 0)
                {
                    productsInCart.Add(currentShelf.Find("shelftrigger").GetComponent<shelfScript>().itemId);
                    shelfsWithNeedProducts.Remove(currentShelf.gameObject);
                }
            }
        }  
    }

    void Start()
    {
        for (int i = 0; i < Random.Range(2, 7); i++) { productsBuy.Add(Random.Range(0, productManager.GetComponent<ProductManager>().products.Count)); Debug.Log(productsBuy[i]); }
        
        foreach (Transform shelf in MainShelfs.transform) { shelfs.Add(shelf.gameObject); }


        for (int i = 0; i < shelfs.Count; i++)
        {
            if (shelfs[i].transform.Find("shelftrigger").GetComponent<shelfScript>().itemId >= 0 && shelfs[i].transform.Find("shelftrigger").GetComponent<shelfScript>().count > 0)
            {
                if (productsBuy.Contains(shelfs[i].transform.Find("shelftrigger").GetComponent<shelfScript>().itemId) && productsBuy[productsBuy.IndexOf(shelfs[i].transform.Find("shelftrigger").GetComponent<shelfScript>().itemId)] == shelfs[i].transform.Find("shelftrigger").GetComponent<shelfScript>().itemId)
                {
                    shelfsWithNeedProducts.Add(shelfs[i]);
                    while (true)
                    {
                        if ( productsBuy.Contains(shelfs[i].transform.Find("shelftrigger").GetComponent<shelfScript>().itemId) == true )
                        {
                            productsNeedToBuy.Add(shelfs[i].transform.Find("shelftrigger").GetComponent<shelfScript>().itemId);
                            productsBuy.Remove(shelfs[i].transform.Find("shelftrigger").GetComponent<shelfScript>().itemId);
                        } else { break; }
                    }
                }
            }
        }
        if(shelfsWithNeedProducts.Count == 0) 
        {
            agent.SetDestination(new Vector3(exit.transform.position.x, exit.transform.position.y, exit.transform.position.z));
        } 
        else { StartCoroutine(visitorCoroutine()); }
    }

    void Update()
    {
        animator.SetFloat("Speed", agent.speed);
    }

    void goToShelf(Transform shelfTransform)
    {
        agent.SetDestination(new Vector3(shelfTransform.position.x, shelfTransform.position.y, shelfTransform.position.z));
        currentShelf = shelfTransform;
        isGo = true;
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.tag == "Exit") { Destroy(gameObject); }
    }
}
2

Delete while (true) from the Start method. Avoid using while keyword outside coroutines in general.