Unity Crashing when time slows

I'm participating in a Game Jam and made a Time Slow Powerup for the game. It was working, untill I added some new code and started crashing. The problem is, even after commenting it out, it still crashed. You should know that I am using Unity 2019.4.17f1.

This is the Time Slow code:

void Items() { if(Input.GetKeyDown(KeyCode.T) && timeRecharged) { timeCanCancel = false;

         StartCoroutine(TimeSlow());
         while (timeIsSlow)
         {
             if (Input.GetKeyUp(KeyCode.T))
             {
                 timeCanCancel = true;
             }
             if (Input.GetKeyDown(KeyCode.T) && timeCanCancel)
             {
                 StopCoroutine(TimeSlow());
                 Time.timeScale = 1f;
                 timeIsSlow = false;
                 StartCoroutine(TimeCancel());
             }
         }
     }
 }
 IEnumerator TimeSlow()
 {
     timeRecharged = false;
     Time.timeScale = timeSlowAmount;
     timeIsSlow = true;
     yield return new WaitForSeconds(4f);
     Time.timeScale = 1f;
     timeIsSlow = false;
     yield return new WaitForSeconds(7f);
     timeRecharged = true;
 }
 IEnumerator TimeCancel()
 {
     yield return new WaitForSeconds(4f);
     timeRecharged = true;
 }