Conflict with WPML

When I activate _Comment Popularity_ along with _WPML_ (the popular multilingual plugin), I get the following error:

`Catchable fatal error: Object of class Twig_Source could not be converted to string in /.../wp-content/plugins/comment-popularity/inc/lib/twig/twig/lib/Twig/Lexer.php on line 87`

The same error occurs also on a plain vanilla WordPress install with only these 2 plugins activated.
It seems there's a conflict on the different Twig version included by the plugins (see also [this topic](https://wpml.org/forums/topic/twig-update/) on WPML support forum).

Is there something that can be done to ensure compatibility with WPML? I.e. downgrading the version of Twig shipped with your plugin.