count(): Parameter must be an array or an object that implements Countable

It happens that editing a post we get an exception:

ErrorException

Warning: count(): Parameter must be an array or an object that implements Countable

in file wp-content/plugins/graphcomment-comment-system/class/services/gc_params_service.class.php in GcParamsService::graphcommentGetNbrWebsites at line 365

  public function graphcommentGetNbrWebsites()
  {
    $this->graphcommentInitWebsites();
    return count($this->gc_websites);
  }

can you help us to fix it?

The page I need help with: [log in to see the link]