Style/IfInsideElse error: undefined method `last_line' for nil:NilClass

[rc-tom]

When linting my code, Rubocop reports that an error occurred in the Style/IfInsideElse cop.

---

Expected behavior

I expect Rubocop to not produce an error.

Actual behavior

An error occurs.

Debug backtrace

> bundle exec rubocop -d tester.rb

warning: parser/current is loading parser/ruby25, which recognizes
warning: 2.5.8-compliant syntax, but you are running 2.5.7.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
For /Users/tom/Projects/myproject: configuration from /Users/tom/Projects/myproject/.rubocop.yml
configuration from /Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-rake-0.5.1/config/default.yml
configuration from /Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-rake-0.5.1/config/default.yml
Default configuration from /Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/config/default.yml
configuration from /Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-rspec-2.1.0/config/default.yml
configuration from /Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-rspec-2.1.0/config/default.yml
configuration from /Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-performance-1.9.2/config/default.yml
configuration from /Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-performance-1.9.2/config/default.yml
Inheriting configuration from /Users/tom/Projects/myproject/.rubocop_todo.yml
Inspecting 1 file
Scanning /Users/tom/Projects/myproject/tester.rb
An error occurred while Style/IfInsideElse cop was inspecting /Users/tom/Projects/myproject/tester.rb:3:0.
undefined method `last_line' for nil:NilClass
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/mixin/range_help.rb:72:in `range_by_whole_lines'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/style/if_inside_else.rb:90:in `autocorrect'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/style/if_inside_else.rb:76:in `block in on_if'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/base.rb:339:in `correct'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/base.rb:126:in `add_offense'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/style/if_inside_else.rb:75:in `on_if'
org/jruby/RubyKernel.java:1960:in `public_send'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/commissioner.rb:100:in `block in trigger_responding_cops'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/commissioner.rb:166:in `with_cop_error_handling'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/commissioner.rb:99:in `block in trigger_responding_cops'
org/jruby/RubyArray.java:1809:in `each'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/commissioner.rb:98:in `trigger_responding_cops'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/commissioner.rb:69:in `on_if'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-ast-1.4.0/lib/rubocop/ast/traversal.rb:157:in `on_if'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/commissioner.rb:71:in `on_if'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-ast-1.4.0/lib/rubocop/ast/traversal.rb:20:in `walk'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/commissioner.rb:86:in `investigate'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/team.rb:157:in `investigate_partial'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cop/team.rb:83:in `investigate'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:315:in `inspect_file'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:259:in `block in do_inspection_loop'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:293:in `block in iterate_until_no_changes'
org/jruby/RubyKernel.java:1442:in `loop'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:286:in `iterate_until_no_changes'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:255:in `do_inspection_loop'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:132:in `block in file_offenses'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:157:in `file_offense_cache'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:131:in `file_offenses'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:122:in `process_file'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:101:in `block in each_inspected_file'
org/jruby/RubyArray.java:1809:in `each'
org/jruby/RubyEnumerable.java:1126:in `inject'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:100:in `each_inspected_file'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:86:in `inspect_files'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/runner.rb:47:in `run'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cli/command/execute_runner.rb:26:in `block in execute_runner'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cli/command/execute_runner.rb:52:in `with_redirect'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cli/command/execute_runner.rb:17:in `run'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cli/command.rb:11:in `run'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cli/environment.rb:18:in `run'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cli.rb:65:in `run_command'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cli.rb:72:in `execute_runners'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/lib/rubocop/cli.rb:41:in `run'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/exe/rubocop:13:in `block in <main>'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/stdlib/benchmark.rb:308:in `realtime'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/rubocop-1.7.0/exe/rubocop:12:in `<main>'
org/jruby/RubyKernel.java:1009:in `load'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/bin/rubocop:23:in `<main>'
org/jruby/RubyKernel.java:1009:in `load'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/cli/exec.rb:63:in `kernel_load'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/cli/exec.rb:28:in `run'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/cli.rb:476:in `exec'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/vendor/thor/lib/thor.rb:399:in `dispatch'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/cli.rb:30:in `dispatch'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/vendor/thor/lib/thor/base.rb:476:in `start'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/cli.rb:24:in `start'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/exe/bundle:46:in `block in <main>'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/lib/bundler/friendly_errors.rb:123:in `with_friendly_errors'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/lib/ruby/gems/shared/gems/bundler-2.1.4/exe/bundle:34:in `<main>'
org/jruby/RubyKernel.java:1009:in `load'
/Users/tom/.asdf/installs/ruby/jruby-9.2.13.0/bin/bundle:23:in `<main>'
.
1 file inspected, no offenses detected
1 error occurred:
An error occurred while Style/IfInsideElse cop was inspecting /Users/tom/Projects/myproject/tester.rb:3:0.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
https://github.com/rubocop-hq/rubocop/issues
Mention the following information in the issue report:
1.7.0 (using Parser 2.7.2.0, rubocop-ast 1.4.0, running on jruby 2.5.7 java)
Finished in 2.6855570369953057 seconds

Steps to reproduce the problem

Lint the following file using RuboCop 1.7:

if a
  blah if COND
elsif b
  foo if COND
else
  bar if COND
end

RuboCop version

$ bundle exec rubocop -V
1.7.0 (using Parser 2.7.2.0, rubocop-ast 1.4.0, running on jruby 2.5.7 java)
  - rubocop-performance 1.9.2
  - rubocop-rake 0.5.1
  - rubocop-rspec 2.1.0

[joshbuker]

Running into this exact issue on some legacy code. I'm guessing most people are just wrapping the second conditional into the original if/else chain?