unity c# - IndexOutOfRangeException

So I made a little game that has a problem. As soon as I load the game, I get errors. Lots of them.

I can't seem to find the problem in this code:

 //This is where the exception is
 Touch touch = Input.touches [0];

 float TouchTime;
 
         if (touch.phase == TouchPhase.Began) {
             TouchTime = Time.time;
         }
 
         if (touch.phase == TouchPhase.Ended || touch.phase == TouchPhase.Canceled) {
             if (Time.time - TouchTime <= 0.5) {
                 //response to tap
                 print ("");
 
             }
             else {
                 print ("Long press was" + TouchTime + "seconds long.");
             }
         }
 

Also this was in the update() method, which might explain the huge number of errors, but how do I fix this?