The script is working but why when I try to change stuff in inspector the game is freezing ?

Everything is working when I'm running the game but once I put the mouse cursor on the variable timeToSpin field box in the inspector before I even can change the value there the whole game is freezing and I need to shut it down with task manager.

Something the script make it but not sure what and why and how to fix it.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class MissleLauncherRotation : MonoBehaviour
 {
     public Transform body;
     public Transform guns;
     public Vector3 spinAxisBody;
     public Vector3 spinAxisGuns;
     public float timeToSpin = 5f;
 
     public bool randomSpin = false;
 
     // Yes, if you make Start return IEnumerator it is automatically run as a 
     // Coroutine by Unity without the need for extra code
     IEnumerator Start()
     {
         while (true)
         {
             // This is the more convenient way of checking for a bool == true
             if (randomSpin)
             {
                 spinAxisBody = new Vector3(0, Random.Range(-180, 180), 0);
 
                 spinAxisGuns = new Vector3(Random.Range(-40, 0), 0, 0);
             }
             else
             {
                 // whatever you want to happen otherwise
             }
 
             // Pre cache/calculate the start and end rotations 
             // Rotate per default uses the LOCAL space so we will do the same and use localRotation
             // But instead of adding to the existing rotation we will use it as a complete new rotation
             var startBodyRotation = body.localRotation;
             var targetBodyRotation = Quaternion.Euler(spinAxisBody);
 
             var startGunsRotation = guns.localRotation;
             var targetGunsRotation = Quaternion.Euler(spinAxisGuns);
 
             // Basically same as the while loop but I prefer to use a for loop so I can't forget to increase the timer
             // In my opinion this is simply better readable
             for (float spinTimer = 0; spinTimer < timeToSpin; spinTimer += Time.deltaTime)
             {
                 // Factor linear moving from 0 to 1 within timeToSpin seconds
                 var factor = spinTimer / timeToSpin;
                 // optional add ease-in and -out
                 //factor = Mathf.SmoothStep(0, 1, factor);
 
                 // Interpolate linear (or with ease-in and -out) between the pre cached start and end rotations
                 body.transform.localRotation = Quaternion.Lerp(startBodyRotation, targetBodyRotation, factor);
                 guns.localRotation = Quaternion.Lerp(startGunsRotation, targetGunsRotation, factor);
 
                 yield return null;
             }
 
             // Just to be sure to end up with clean values
             body.transform.localRotation = targetBodyRotation;
             guns.localRotation = targetGunsRotation;
         }
     }
 }