An error occurred while IfUnlessModifier...

[masterkain]

As mentioned in the blog post about the 0.8.0 release, here's what I'm getting.

In the project (rails) root I have the file .rubocop.yml, where I attempt to define some behaviors:

LineLength:
  Enabled: false

MethodLength:
  Enabled: false

LeadingCommentSpace:
  Enabled: false

However when this file is read by rubocop I get this stack trace on every file:

An error occurred while IfUnlessModifier cop was inspecting lib/artwork_engine.rb.
undefined method `[]' for nil:NilClass
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cop/line_length.rb:19:in `max'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cop/favor_modifier.rb:23:in `check'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cop/favor_modifier.rb:53:in `on_if'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:237:in `process'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/parser-2.0.0.beta2/lib/parser/ast/processor.rb:172:in `on_if'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cop/favor_modifier.rb:55:in `on_if'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:237:in `process'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/parser-2.0.0.beta2/lib/parser/ast/processor.rb:125:in `on_def'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:237:in `process'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:253:in `block in process_all'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:252:in `map'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:252:in `process_all'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/parser-2.0.0.beta2/lib/parser/ast/processor.rb:6:in `process_regular_node'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:237:in `process'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/parser-2.0.0.beta2/lib/parser/ast/processor.rb:114:in `on_class'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:237:in `process'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:253:in `block in process_all'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:252:in `map'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:252:in `process_all'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/parser-2.0.0.beta2/lib/parser/ast/processor.rb:6:in `process_regular_node'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/ast-1.0.2/lib/ast/processor.rb:237:in `process'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cop/cop.rb:50:in `inspect'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cli.rb:100:in `block in inspect_file'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cli.rb:92:in `each'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cli.rb:92:in `inspect_file'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cli.rb:59:in `block in run'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cli.rb:41:in `each'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/lib/rubocop/cli.rb:41:in `run'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/bin/rubocop:14:in `block in <top (required)>'
/Users/kain/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/gems/rubocop-0.8.0/bin/rubocop:13:in `<top (required)>'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/bin/rubocop:23:in `load'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@global/bin/rubocop:23:in `<main>'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@mygemset/bin/ruby_noexec_wrapper:14:in `eval'
/Users/kain/.rvm/gems/ruby-2.0.0-p195@mygemset/bin/ruby_noexec_wrapper:14:in `<main>'

Removing the file and no errors are thrown.

[jatap]

Same error result with this environment:

Configuration file: .rubocop.yml

AllCops:
  Includes:
    - Rakefile
    - config.ru
  Excludes:
    - db/**
    - config/**
    - script/**
    - tmp/**

MethodLength:
  Max: 30

Encoding:
  Enabled: false

LineLength:
  Enabled: false

File: app/models/ability.rb

    if user.has_role? :admin
      can :manage, :all
    elsif user.has_role? :moderator
      can :crud, User
      can :dashboard, :admin
    elsif user.has_role? :user
      can :read, User
      can :dashboard, :admin
    elsif user.has_role? :guest
      can :read, User
    end

EDIT
With 0.7.2 no errors found.

[bbatsov]

@jonas054, seems to me there is some problem with the configuration defaults. Could you take a look at this?

[jonas054]

Yes.

[anthonyryan1]

Same issue with the following config:

LineLength:
  Enabled: false

Tab:
  Enabled: false

# Allow the ruby 1.8 hash syntax until we drop ruby 1.8 support
HashSyntax:
  Enabled: false

[bbatsov]

Fixed by #217.