SharePoint UI Responsive topNav.cloneNode

Hello there,

anybody else has issues with the PnP-Tools-Responsive Design package and oslo masterpage?
I'm always getting the error that topNav.cloneNode is null. On most pages you don't see any difference. But on some SiteCollections on SubSites Document Libraries this error gets into a loop and the page freezes completely.

Anybody has an idea how to fix this?

Kind Regards,

Igor