WPML + Image resize issues

[Kwapi]

Timber 1.5.2, Wordpress 4.9, PHP 5.6

Using the latest version of WPML on a translated page the resized images' urls have a trailing language query string i.e /?lang=fr.
This causes the images not to display and output the following error:

notice: 
Undefined index: extension in /app/wp-content/plugins/timber-library/lib/ImageHelper.php on line 386
Call Stack:    0.0013     239376   
1. {main}() /app/index.php:0    0.0013     239800   
2. require('/app/wp-blog-header.php') /app/index.php:17    1.3295   13947168   
3. require_once('/app/wp-includes/template-loader.php') /app/wp-blog-header.php:19    1.3515   13900384   
4. include('/app/wp-content/themes/made_ioc/page.php') /app/wp-includes/template-loader.php:74    2.5708   15274152   
5. Timber\Timber::render() /app/wp-content/themes/made_ioc/page.php:137    2.5708   15274296

(...)

I'm resizing the images using the resize filter in a Twig template.

[Kwapi]

Managed to fix it by replacing home_url() with site_url() at line 171 of URLHelper.php.
@jarednova Perhaps you could fix that in the new version? I'm happy to create a pull request.

This seems to be a similar issue to this

[jarednova]

@Kwapi Yes, please submit a PR to this please! Tracking down when to use home_url vs site_url has been a continual piece of work. I'd love to get this one resovled