javascript - Cannot read property 'removeAttribute' of null: Cant find source of it

Question

Im getting errors over and over again on each of my sites:

VM42958:5 Uncaught TypeError: Cannot read property 'removeAttribute' of null
(anonymous function) @ VM42958:5
(anonymous function) @ VM42958:20

Unfortunately i cant find the source of this error. If i open the related JavaScript lines i find the following:

VM42958

(function()
{
  var style = document.getElementById("9mr7n8lmeyjxk84i17g5ws714i") ||
              document.documentElement.shadowRoot.getElementById("9mr7n8lmeyjxk84i17g5ws714i");
  style.removeAttribute("id");
  Object.defineProperty(style, "disabled", {value: false, enumerable: true});
  Object.defineProperty(style.sheet, "disabled", {value: false, enumerable: true});
  var deleteRule = CSSStyleSheet.prototype.deleteRule;
  CSSStyleSheet.prototype.deleteRule = function(index)
  {
    if (this != style.sheet)
      deleteRule.call(this, index);
  }
  var removeRule = CSSStyleSheet.prototype.removeRule;
  CSSStyleSheet.prototype.removeRule = function(index)
  {
    if (this != style.sheet)
      removeRule.call(this, index);
  }
})();

This is not my code and i have no idea where it is comming from or where it is used. As libraries im using bootstrap, jQuery and Chart.js.

Does somebody know this part of code or is there a way to find the source of this error. i mean directly the line where it is appearing?

The same error occurs in this jsFiddle for example: jsFiddle

Answer 1

Same problem here. For some reason Chrome ADBlock (not plus) was the cause.