XF 2.0 Widget template is adding current route to an image source URL

[Marcel]

...and I can't figure out why

My thread entity has an extra field which stores the server path of a thumbnail
All the code is set up to pull it through into a widget.

Adding this to the widget template :

{$thread.mbth_thumb_url}

correctly gives

"/data/thumbs/12345.jpg"

However, adding this to the widget template :

<img src="{$thread.mbth_thumb_url}" />[/img]

incorrectly tries to render an image with the URL of

http://host/xenforo/ewr-porta/data/mbth_thumbs/668868.jpg

The correct url should be

http://host/xenforo/data/mbth_thumbs/668868.jpg

How do I stop it automatically adding 'ewr-porta' (Which is from EWR's XenPorta2, where I'm displaying the widget.
If I display the widget somewhere else, for example on Forum List : Above Nodes, it renders the thumb URL correctly.

Thank you

 

[Marcel]

Fixed it!

I changed the line in the template to

<img src="{$xf.options.boardUrl}/{$thread.mbth_thumb_url}" />