Jekyll undefined method [] for nil

If you get

C:\Users\Desktop\Projects\websites\website.com>start_jekyll.bat
jekyll 4.3.2 | Error:  undefined method `[]' for nil
C:/Dev/Ruby33-x64/lib/ruby/3.3.0/logger.rb:384:in `level': undefined method `[]' for nil (NoMethodError)

    @level_override[Fiber.current] || @level
                   ^^^^^^^^^^^^^^^
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.2/lib/jekyll/log_adapter.rb:45:in `adjust_verbosity'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.2/lib/jekyll/configuration.rb:143:in `config_files'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.2/lib/jekyll.rb:118:in `configuration'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.2/lib/jekyll/command.rb:44:in `configuration_from_options'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.2/lib/jekyll/commands/serve.rb:83:in `block (2 levels) in init_with_program'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `block in execute'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `each'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `execute'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/program.rb:44:in `go'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary.rb:21:in `program'
        from C:/Dev/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.2/exe/jekyll:15:in `<top (required)>'
        from C:/Dev/Ruby33-x64/bin/jekyll:32:in `load'
        from C:/Dev/Ruby33-x64/bin/jekyll:32:in `<main>'

Run

bundle update

This should fix the problem

Reference: