TWebTableControl error AError: TypeError: el is null when I click table cell

Hi,

This issue is very difficult to reproduce but from time to time when I click table row I get an error like this:

Object { AMessage: "TypeError: el is null", AFile: "https://ftapp.com/test/dotwpwa.js", ALineNumber: 76652, AColNumber: 11, AStack: "this.SetRowIndex@https://ftapp.com/test/dotwpwa.js:76652:11\nthis.HandleDoMouseDown@https://ftapp.com/test/dotwpwa.js:76875:37\ncb@https://ftapp.com/test/dotwpwa.js:241:26\n", AError: TypeError }
​
AColNumber: 11
​
AError: TypeError: el is null
​
AFile: "https://ftapp.com/test/dotwpwa.js"
​
ALineNumber: 76652
​
AMessage: "TypeError: el is null"

The line 76652 in my java script is here:

    this.SetRowIndex = function (Value) {
      var el = null;
      if (this.FRowIndex !== -1) {
        el = this.GetCellElement(0,this.FRowIndex);
        if (this.FElementRowSelectClassName === "") {
          **el.parentElement.style.removeProperty("color");** <-- 76652 is here
          el.parentElement.style.removeProperty("background-color");
        } else el.parentElement.className = "";
      };
      this.FRowIndex = Value;
      if (this.FRowIndex !== -1) {
        el = this.GetCellElement(0,this.FRowIndex);
        if (this.FElementRowSelectClassName === "") {
          el.parentElement.style.setProperty("color",pas["WEBLib.Graphics"].ColorToHTML(this.FSelectionTextColor));
          el.parentElement.style.setProperty("background-color",pas["WEBLib.Graphics"].ColorToHTML(this.FSelectionColor));
        } else el.parentElement.classList.add(this.FElementRowSelectClassName);
      };
    };

It is unclear what causes this, but we added extra checks to prevent this from resulting in an error.
Next update will have this improvement.