If git was built from source, the version appears as:

git version 2.39.GIT

This regex fails, producing a nil version:

Fix:
version = output[/\d+.\d+(.(?:GIT|\d+))+/]

This at least prevents it from failing with this error:

../.local/share/gem/ruby/3.0.0/gems/git-1.13.0/lib/git/lib.rb:1034:in current_command_version': undefined method split' for nil:NilClass (NoMethodError)