ActionView::Template::Error: undefined method `description' for nil:NilClass

[komagata]

View details in Rollbar: https://app.rollbar.com/a/komagata/fix/item/Bootcamp/1795

NoMethodError: undefined method `description' for nil:NilClass
  File "/app/app/views/paper/exercise_procedure_document/show.html.slim", line 43, in block (2 levels) in _app_views_paper_exercise_procedure_document_show_html_slim___2310313471062741575_659280
  File "/usr/local/bundle/gems/activerecord-6.1.4.7/lib/active_record/relation/delegation.rb", line 88, in each
  File "/usr/local/bundle/gems/activerecord-6.1.4.7/lib/active_record/relation/delegation.rb", line 88, in each
  File "/app/app/views/paper/exercise_procedure_document/show.html.slim", line 33, in each_with_index
  File "/app/app/views/paper/exercise_procedure_document/show.html.slim", line 33, in block in _app_views_paper_exercise_procedure_document_show_html_slim___2310313471062741575_659280
  File "/usr/local/bundle/gems/activerecord-6.1.4.7/lib/active_record/relation/delegation.rb", line 88, in each
  File "/usr/local/bundle/gems/activerecord-6.1.4.7/lib/active_record/relation/delegation.rb", line 88, in each
  File "/app/app/views/paper/exercise_procedure_document/show.html.slim", line 32, in each_with_index
  File "/app/app/views/paper/exercise_procedure_document/show.html.slim", line 32, in _app_views_paper_exercise_procedure_document_show_html_slim___2310313471062741575_659280
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/base.rb", line 247, in public_send
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/base.rb", line 247, in _run
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/template.rb", line 154, in block in render
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/notifications.rb", line 205, in instrument
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/template.rb", line 345, in instrument_render_template
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/template.rb", line 152, in render
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/renderer/template_renderer.rb", line 61, in block (2 levels) in render_template
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/notifications.rb", line 203, in block in instrument
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/notifications/instrumenter.rb", line 24, in instrument
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/notifications.rb", line 203, in instrument
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/renderer/template_renderer.rb", line 56, in block in render_template
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/renderer/template_renderer.rb", line 71, in block in render_with_layout
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/notifications.rb", line 203, in block in instrument
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/notifications/instrumenter.rb", line 24, in instrument
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/notifications.rb", line 203, in instrument
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/renderer/template_renderer.rb", line 70, in render_with_layout
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/renderer/template_renderer.rb", line 55, in render_template
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/renderer/template_renderer.rb", line 11, in render
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/renderer/renderer.rb", line 61, in render_template_to_object
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/renderer/renderer.rb", line 29, in render_to_object
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/rendering.rb", line 117, in block in _render_template
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/base.rb", line 273, in in_rendering_context
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/rendering.rb", line 116, in _render_template
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/streaming.rb", line 218, in _render_template
  File "/usr/local/bundle/gems/actionview-6.1.4.7/lib/action_view/rendering.rb", line 103, in render_to_body
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/rendering.rb", line 52, in render_to_body
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/renderers.rb", line 142, in render_to_body
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/abstract_controller/rendering.rb", line 25, in render
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/rendering.rb", line 36, in render
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/instrumentation.rb", line 46, in block (2 levels) in render
  File "/usr/local/lib/ruby/3.1.0/benchmark.rb", line 311, in realtime
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/core_ext/benchmark.rb", line 14, in ms
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/instrumentation.rb", line 46, in block in render
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/instrumentation.rb", line 86, in cleanup_view_runtime
  File "/usr/local/bundle/gems/activerecord-6.1.4.7/lib/active_record/railties/controller_runtime.rb", line 34, in cleanup_view_runtime
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/instrumentation.rb", line 45, in render
  File "/usr/local/bundle/gems/meta-tags-2.19.0/lib/meta_tags/controller_helper.rb", line 22, in render
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/implicit_render.rb", line 35, in default_render
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/basic_implicit_render.rb", line 6, in block in send_action
  File "<internal:kernel>", line 90, in tap
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/basic_implicit_render.rb", line 6, in send_action
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/abstract_controller/base.rb", line 228, in process_action
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/action_controller/metal/rendering.rb", line 30, in process_action
  File "/usr/local/bundle/gems/actionpack-6.1.4.7/lib/abstract_controller/callbacks.rb", line 42, in block in process_action
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/callbacks.rb", line 117, in block in run_callbacks
  File "/usr/local/bundle/gems/react-rails-3.1.1/lib/react/rails/controller_lifecycle.rb", line 33, in use_react_component_helper
  File "/usr/local/bundle/gems/activesupport-6.1.4.7/lib/active_support/callbacks.rb", line 126, in block in run_callbacks
  File "/usr/local/bundle/gems/acti