Gallery app error message

Installed the gallery app and all is working okay, except for this message on the 'Editing Image' page.

Notice: Undefined variable: filter in /home/forge/darcybear.co.uk/public/perch/addons/apps/perch_gallery/modes/image.edit.post.php on line 36 Call Stack #TimeMemoryFunctionLocation 10.0003246680{main}( )../index.php:0 20.03071973128include( '/home/forge/darcybear.co.uk/public/perch/addons/apps/perch_gallery/modes/image.edit.post.php' )../index.php:30 ">

Perch 2.7.9 and the latest version of the Gallery app.