Fatal error: Unsupported operand types

This happens when I have configured my site as a oEmbed provider and accessing a the public endpoint:

http://localhost/[site-name]/oembed/endpoint/?url=http://localhost/media...

Fatal error: Unsupported operand types in oembed/oembedprovider/plugins/providers/file.inc on line 54

The following code block

$result += array(
            'type' => 'photo',
            'url' => file_create_url($file->uri),
          ) + $file->image_dimensions;

It seems that $file->image_dimensions doesn't actually exist, it is being replaced by $file->metadata

I am using media module 7.x-2.0-alpha3 and file entity 7.x-2.0-alpha3

I will post a patch shortly.