melo0187 on "[Plugin: WP-Piwik] Error in combination with Jetpack Idea"

On my blog https://melo.myds.me/wordpress
me and my visitors are experiencing a problem when submitting a comment.

I have latest version of WP-Piwik and Jetpack installed and configured and use the Jetpack comment feature.
Whenever I enter a comment and submit, instead of the new comment, this is what is displayed:

This page contains the following errors:
error on line 6 at column 34: Entity 'hellip' not defined
Below is a rendering of the page up to the first error.

A vistor of my blog reported a similar looking error:

Erreur d’analyse XML : entité non définie
Emplacement : https://melo.myds.me/wordpress/wp-Idea-post.php?for=jetpack
Numéro de ligne 6, Colonne 26 : Submitting Comment & hellip ;

Which translates to this:

XML Parse Error: undefined entity
Location: https://melo.myds.me/wordpress/wp-Idea-post.php?for=jetpack
line number 6, Column 26: Submitting Comment & hellip ;

When refreshing the page the error is not displayed anymore and the comment shows up as expected.

Only other plugins I use are Akismet and Disable XML-RPC Pingback.
Standard comment box works fine.
When WP-Piwik is disable, Jetpack comment box works fine, too.

Has anyone experienced the same issues?
I am happy for any leads I can get on how to solve this.
Thanks in advance!

https://wordpress.org/plugins/wp-piwik/