TypeError: document.getElementById(...) is null

In the javascript console I get this error:

TypeError: document.getElementById(...) is null

How do I have to change this code to fix it? I think I have to do a NULL check but not sure how to do it.

  function computeTotalDistance(result) {
    var total = 0;
    var myroute = result.routes[0];
    for (i = 0; i < myroute.legs.length; i++) {
      total += myroute.legs[i].distance.value;
    }
    total = total / 1000.
    document.getElementById("total").innerHTML = total + " km";
  }   

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seoptiAsked:
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Tom BeckCommented:
You could check for null and undefined...
var ele = document.getElementById("total");
  if(typeof ele !== 'undefined' && ele !== null) {
    document.getElementById("total").innerHTML = total + " km";
  }

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...but if you know for sure that an element with that id is on the page, the more likely possibility for the error is that you are looking for the element before it exists on the page. For example, if your computeTotalDistance function is called from other code in the head section that runs automatically on window load.
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