AJAX HTTP error occurred (on Views)

If you get HTTP Result Code: 500, you should see into server error log.
In my case this was because of the big length of the AJAX POST request. The POST request include inter alia all js file names. When we enabled many edge fonts, we have long js file names, accordingly long POST request.
You should change server settings to be able to pass a large POST requests. If it not possible, you should remove the long edge font paths from POST request. I added this custom js code:

(function ($) {
  Drupal.behaviors.custom_features = {
    attach: function (context, settings) {
      $.each(Drupal.settings.ajaxPageState.js, function(index, value) {
        if (index.length > 1000) {
          delete Drupal.settings.ajaxPageState.js[index];
        }
      });
    }
  }
})(jQuery);