Uncaught TypeError: Cannot read property 'querySelectorAll' of null

[hackzusheng]

Uncaught TypeError: Cannot read property 'querySelectorAll' of null

google chrome 84.0.4147.135

js/results.js:41

//numbering results && self-inovking the function
(function(cl){
  var table = document.querySelector('table.' + cl)
  var trs = table.querySelectorAll('tr')
  var counter = 1

  Array.prototype.forEach.call(trs, function(x,i){
    var firstChild = x.children[0]