Sidebar missing when using Wiki

Hello,

When using the WPMU DEV Wiki plugin with Nelo, the sidebar widget for the Wiki pages shows no widgets (see: http://monipag.com/wiki/bienvenue-sur-le-wiki-de-monipag-com/). I hope there would be a special sidebar for the wiki Pages in Appearance > Widgets, but nothing here special for Wiki. Problem due to Nelo or to the plugin itself?

Thank you in advance for your help!