If you can reproduce this, please provide more information about the kind of page you are trying to view. I can't reproduce this on my site.
It might be possible for this to occur while uploading the Beta 3 package if:
1. src/addons/vw/vw/_core/view/ui/area/vw.php uploads.
2. Someone visits wiki content.
3. src/addons/vw/vw/_core/model/url/vw.php uploads later.
During #2, this error may occur. In this case, it would be safe to ignore.