I had the eval version, Web Help Desk 12.3 and upgraded to a licensed version 12.4. The upgrade went OK but then I was prompted to upgrade the database through my web browser and got the following error
Firefox
Server 2012 r2 (x64)
VM on Hyper-V
Here you go sir.
java.lang.NullPointerException when clicking on Techs in Setup menu - SolarWinds Worldwide, LLC. Help and Support