INFO Steam::Categorizer::GameLibrary : Generating steam config...
/home/roosta/.gem/ruby/2.4.0/gems/steam-categorizer-0.5.8/lib/steam/categorizer.rb:137:in `generate_steam_config': undefined method `[]' for nil:NilClass (NoMethodError)
from /home/roosta/.gem/ruby/2.4.0/gems/steam-categorizer-0.5.8/exe/steam-categorizer:29:in `<top (required)>'
from /home/roosta/.gem/ruby/2.4.0/bin/steam-categorizer:22:in `load'
from /home/roosta/.gem/ruby/2.4.0/bin/steam-categorizer:22:in `<main>'
Wasn't sure if I should post a new issue or add a comment in this: https://github.com/Lyle-Tafoya/Steam-Categorizer/issues/21 since they are kinda related.
This line here on line 137
Had to change this to 'UserLocalConfigStore' and everthing ran fine.