Warning: creating default object db-class.php

Hi,
after installing I got warning on creating default object in db-class.php. Login to my wp-backend was not possible any more. I fixed it myself in this way.

Error:
Warning: Creating default object from empty value in ../plugins/final-tiles-grid-gallery-lite/lib/db-class.php on line 152

Warning: Cannot modify header information – headers already sent by (output started at ../plugins/final-tiles-grid-gallery-lite/lib/db-class.php:152) in ../wp-admin/includes/misc.php on line 1196

Fix: add line 152: if(isset($data->Id))

Modified function getGalleries():
public function getGalleries()
{
global $wpdb;
$tb_g = $wpdb->prefix . “FinalTiles_gallery”;
$tb_i = $wpdb->prefix . “FinalTiles_gallery_images”;

$query = “SELECT Id, configuration FROM $tb_g order by id”;
$galleryResults = $wpdb->get_results( $query );

$result = array();
foreach($galleryResults as $gallery)
{
$data = json_decode($gallery->configuration);
if(isset($data->Id)) /* new added by myself */
$data->Id = $gallery->Id;
$result[] = $data;
}
return $result;
}