ToggleStateCls returns js error

Hi there, guys. I found a bug at the LayerManager: I've got an html comment as a layer in the LM. I click the comment. I get an error at the console:

Uncaught TypeError: Cannot read property 'remove' of undefined

And the code this error relates to is: src/style_manager/view/SectorsView.js:47

  toggleStateCls(targets = [], enable) {
    targets.forEach(trg => {
      const el = trg.getEl();
      el && el.classList[enable ? 'add' : 'remove'](helperCls);
    });
  },

So, html comments cant have classList property and this is the bug.