I've encountered an error while using the custom sort order in the gallery.
I ordered images manually on the "Gallery" tab and then selected "Sort Images by = Custom" in the settings of the gallery module of the page.
When I open this gallery I see the following error after page's description, before the actual gallery:
This may be seen here: http://locher.ru/travel/europe/spain/toledo_cs/Notice: Undefined index: in /home/www/z114793/htdocs/x3/extensions/twig-extensions.inc.php on line 170 Notice: Undefined index: in /home/www/z114793/htdocs/x3/extensions/twig-extensions.inc.php on line 170 Notice: Undefined index: in /home/www/z114793/htdocs/x3/extensions/twig-extensions.inc.php on line 170 Notice: Undefined index: in /home/www/z114793/htdocs/x3/extensions/twig-extensions.inc.php on line 170
The same gallery with the default, name-based sort works fine (http://locher.ru/travel/europe/spain/toledo/)