Layout/ElseAlignment failed with "undefined method `line' for nil:NilClass"

[YukiJikumaru]

Expected behavior

rubocp should success without complaint.

Actual behavior

rubocp failed and "undefined method `line' for nil:NilClass" occurs.

Steps to reproduce the problem

[jiku@centos7 rubocop_else_alignment_error]$ cat sample.rb 
# frozen_string_literal: true

SAMPLE_NUMBERS = [1, 2, 3].freeze

def execute
  SAMPLE_NUMBERS.each do |num|
    do_something(num)
  rescue StandardError
    logger.error('ERROR')
  else
    logger.info('OK')
  end
end
[jiku@centos7 rubocop_else_alignment_error]$ ruby -c sample.rb 
Syntax OK

[jiku@centos7 rubocop_else_alignment_error]$ bundle exec rubocop -d sample.rb                                                                                                                                      
For /home/jiku/rubocop_else_alignment_error: configuration from /home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/config/default.yml
Inheriting configuration from /home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/config/enabled.yml
Inheriting configuration from /home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/config/disabled.yml
Inspecting 1 file
Scanning /home/jiku/rubocop_else_alignment_error/sample.rb
An error occurred while Layout/ElseAlignment cop was inspecting /home/jiku/rubocop_else_alignment_error/sample.rb:7:4.
undefined method `line' for nil:NilClass
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/mixin/end_keyword_alignment.rb:75:in `effective_column'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/layout/else_alignment.rb:117:in `check_alignment'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/layout/else_alignment.rb:60:in `on_rescue'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/commissioner.rb:44:in `block (2 levels) in on_rescue'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/commissioner.rb:109:in `with_cop_error_handling'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/commissioner.rb:43:in `block in on_rescue'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/commissioner.rb:42:in `each'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/commissioner.rb:42:in `on_rescue'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/ast/traversal.rb:154:in `on_block'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/commissioner.rb:48:in `on_block'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/ast/traversal.rb:95:in `on_def'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/commissioner.rb:48:in `on_def'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/ast/traversal.rb:49:in `block in on_begin'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/ast/traversal.rb:49:in `each'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/ast/traversal.rb:49:in `on_begin'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/commissioner.rb:48:in `on_begin'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/ast/traversal.rb:12:in `walk'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/commissioner.rb:60:in `investigate'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/team.rb:114:in `investigate'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/team.rb:102:in `offenses'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cop/team.rb:44:in `inspect_file'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:259:in `inspect_file'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:206:in `block in do_inspection_loop'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:238:in `block in iterate_until_no_changes'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:231:in `loop'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:231:in `iterate_until_no_changes'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:202:in `do_inspection_loop'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:111:in `block in file_offenses'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:121:in `file_offense_cache'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:109:in `file_offenses'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:100:in `process_file'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:78:in `block in each_inspected_file'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:75:in `each'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:75:in `reduce'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:75:in `each_inspected_file'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:67:in `inspect_files'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/runner.rb:39:in `run'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cli.rb:156:in `execute_runner'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cli.rb:84:in `execute_runners'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/lib/rubocop/cli.rb:41:in `run'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/bin/rubocop:13:in `block in <top (required)>'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/gems/rubocop-0.53.0/bin/rubocop:12:in `<top (required)>'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/bin/rubocop:23:in `load'
/home/jiku/rubocop_else_alignment_error/vendor/bundle/ruby/2.5.0/bin/rubocop:23:in `<top (required)>'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/cli/exec.rb:75:in `load'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/cli/exec.rb:75:in `kernel_load'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/cli/exec.rb:28:in `run'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/cli.rb:424:in `exec'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/cli.rb:27:in `dispatch'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/cli.rb:18:in `start'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/exe/bundle:30:in `block in <top (required)>'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/lib/bundler/friendly_errors.rb:122:in `with_friendly_errors'
/home/jiku/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bundler-1.16.1/exe/bundle:22:in `<top (required)>'
/home/jiku/.rbenv/versions/2.5.0/bin/bundle:23:in `load'
/home/jiku/.rbenv/versions/2.5.0/bin/bundle:23:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Layout/ElseAlignment cop was inspecting /home/jiku/rubocop_else_alignment_error/sample.rb:7:4.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
Mention the following information in the issue report:
0.53.0 (using Parser 2.5.0.4, running on ruby 2.5.0 x86_64-linux)
Finished in 0.4670725599862635 seconds

RuboCop version

[jiku@centos7 rubocop_else_alignment_error]$ bundle exec rubocop -V
0.53.0 (using Parser 2.5.0.4, running on ruby 2.5.0 x86_64-linux)

[jiku@centos7 rubocop_else_alignment_error]$ uname -a
Linux centos7 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[jiku@centos7 rubocop_else_alignment_error]$ ruby -v
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-linux]

memo https://bugs.ruby-lang.org/issues/12906

[YukiJikumaru]

--- a/lib/rubocop/cop/layout/else_alignment.rb
+++ b/lib/rubocop/cop/layout/else_alignment.rb
@@ -55,6 +55,7 @@ module RuboCop
           base = case parent.type
                  when :def, :defs then base_for_method_definition(parent)
                  when :kwbegin then parent.loc.begin
+                 when :block then parent.send_node.source_range
                  else node.loc.keyword
                  end
           check_alignment(base, node.loc.else)

I tested this patch, fix this error and passed all test.