rubocop:disable Lint errors if the block contains a Lint/UselessAssignment violation

[be-ragheb]

This file causes RuboCop to exit with an error:

# frozen_string_literal: true

# rubocop:disable Lint
unused_variable = 1
puts 'Hello, Lint!'
# rubocop:enable Lint

---

Expected behavior

I would expect RuboCop to find no issues with the above file and exit cleanly.

Actual behavior

$ rubocop --debug disable_lint.rb         
For /Users/benragheb/Projects/rubocop-bug: Default configuration from /Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/config/default.yml
Use parallel by default.
Skipping parallel inspection: only a single file needs inspection
Inspecting 1 file
Scanning /Users/benragheb/Projects/rubocop-bug/disable_lint.rb
An error occurred while Lint/RedundantCopDisableDirective cop was inspecting /Users/benragheb/Projects/rubocop-bug/disable_lint.rb.
undefined method `start_with?' for nil:NilClass
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/lint/redundant_cop_disable_directive.rb:308:in `department_marker?'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/lint/redundant_cop_disable_directive.rb:287:in `describe'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/lint/redundant_cop_disable_directive.rb:229:in `block in add_offense_for_entire_comment'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/lint/redundant_cop_disable_directive.rb:229:in `map'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/lint/redundant_cop_disable_directive.rb:229:in `add_offense_for_entire_comment'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/lint/redundant_cop_disable_directive.rb:220:in `block in add_offenses'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/lint/redundant_cop_disable_directive.rb:218:in `each'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/lint/redundant_cop_disable_directive.rb:218:in `add_offenses'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/lint/redundant_cop_disable_directive.rb:51:in `on_new_investigation'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/commissioner.rb:154:in `block (2 levels) in invoke'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/commissioner.rb:165:in `with_cop_error_handling'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/commissioner.rb:154:in `block in invoke'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/commissioner.rb:154:in `each'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/commissioner.rb:154:in `invoke'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/commissioner.rb:84:in `investigate'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/team.rb:154:in `investigate_partial'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cop/team.rb:82:in `investigate'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:315:in `inspect_file'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:172:in `block in add_redundant_disables'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:193:in `team_for_redundant_disables'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:171:in `add_redundant_disables'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:139:in `block in file_offenses'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:163:in `file_offense_cache'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:137:in `file_offenses'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:128:in `process_file'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:109:in `block in each_inspected_file'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:108:in `each'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:108:in `reduce'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:108:in `each_inspected_file'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:94:in `inspect_files'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/runner.rb:47:in `run'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cli/command/execute_runner.rb:26:in `block in execute_runner'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cli/command/execute_runner.rb:52:in `with_redirect'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cli/command/execute_runner.rb:17:in `run'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cli/command.rb:11:in `run'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cli/environment.rb:18:in `run'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cli.rb:72:in `run_command'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cli.rb:79:in `execute_runners'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/lib/rubocop/cli.rb:48:in `run'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/exe/rubocop:19:in `block in <top (required)>'
/Users/benragheb/.rvm/rubies/ruby-2.6.10/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
/Users/benragheb/.rvm/gems/ruby-2.6.10/gems/rubocop-1.41.0/exe/rubocop:19:in `<top (required)>'
/Users/benragheb/.rvm/gems/ruby-2.6.10/bin/rubocop:23:in `load'
/Users/benragheb/.rvm/gems/ruby-2.6.10/bin/rubocop:23:in `<main>'
/Users/benragheb/.rvm/gems/ruby-2.6.10/bin/ruby_executable_hooks:22:in `eval'
/Users/benragheb/.rvm/gems/ruby-2.6.10/bin/ruby_executable_hooks:22:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Lint/RedundantCopDisableDirective cop was inspecting /Users/benragheb/Projects/rubocop-bug/disable_lint.rb.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
https://github.com/rubocop/rubocop/issues

Mention the following information in the issue report:
1.41.0 (using Parser 3.1.3.0, rubocop-ast 1.24.0, running on ruby 2.6.10) [x86_64-darwin21]
Finished in 0.1961609999416396 seconds

Steps to reproduce the problem

1. create empty directory
2. create Gemfile with gem 'rubocop'
3. bundle install
4. create disable_lint.rb with above content
5. rubocop disable_lint.rb

RuboCop version

1.41.0 (using Parser 3.1.3.0, rubocop-ast 1.24.0, running on ruby 2.6.10) [x86_64-darwin21]

[be-ragheb]

@fatkodima Thank you for addressing this so quickly!