Hangs on an empty mongodb database about node-database-cleaner HOT 4 CLOSED

Cursor.prototype.toArray = function(callback) {
  var self = this;

  if(!callback) {
    throw new Error('callback is mandatory');
  }

  if(this.tailable) {
    callback(new Error("Tailable cursor cannot be converted to array"), null);
  } else if(this.state != Cursor.CLOSED) {
    var items = [];

    this.each(function(err, item) {
      if(err != null) return callback(err, null);

      if(item != null && Array.isArray(items)) {
        items.push(item);
      } else {
        var resultItems = items;
        items = null;
        self.items = [];
        // Returns items
        callback(err, resultItems);
      }
    });
  } else {
    callback(new Error("Cursor is closed"), null);
  }
};