Rails/WhereEquals throughs error with specific ActiveRecord usecase

[mobilutz]

Some code I support, has an implementation, which throughs in error inside Rails/WhereEquals.
The code is strange, but it works and does what it needs to do.

---

Expected behavior

Rubocop should not through an error on the code

Actual behavior

This error is thrown.

undefined method `hash_type?' for nil:NilClass
[...]/rubocop-rails-2.9.0/lib/rubocop/cop/rails/where_equals.rb:71:in `extract_column_and_value'
[...]/rubocop-rails-2.9.0/lib/rubocop/cop/rails/where_equals.rb:41:in `block in on_send'
[...]/rubocop-rails-2.9.0/lib/rubocop/cop/rails/where_equals.rb:64:in `where_method_call?'
[...]/rubocop-rails-2.9.0/lib/rubocop/cop/rails/where_equals.rb:36:in `on_send'

Steps to reproduce the problem

Run rubocop with rubocop-rails >= 2.9.0 on this code:

def sql
  ::User.where('name = :name').select(:id).to_sql
end

::User.where("id IN (#{sql})", name: 'Lastname').first

Yes, this code works and returns the User with name: 'Lastname when it is run!!!!

RuboCop version

❯ bundle exec rubocop -V
1.5.2 (using Parser 2.7.2.0, rubocop-ast 1.3.0, running on ruby 2.7.2 x86_64-darwin19)
  - rubocop-performance 1.9.1
  - rubocop-rails 2.9.0
  - rubocop-rspec 2.0.1```