I am using Avast Free Antivirus I registered and when I click on my link username it says NuL NuL
I have tried uni-stalling and re-installing to see if will fix the issue - But still seem to have the issue
It is the same on mine, reinstalling I suspect will do nothing as this is the retrieval of data from your my.avast.com account. This is independent of the avast installation.
If you open that device information the Nul Nul isn’t displayed only the device name.
I’m not going to get excited about it, I’m sure it will resolve itself in due course.