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Issue update API allows setting null as updated_at which seems to be invalid

Summary

Using the Issue update API as an admin permits setting the updated_at field, setting the value null appears to fail with a 500, but then some issue features break with a 500 as well.

Steps to reproduce

With an admin-powered private token:

curl \
  -XPOST \
  -H 'PRIVATE-TOKEN: secret' \
  -H 'Content-Type: application/json' \
  -d '{"iid":2051,"title":"Test"}' \
  https://gitlab.acme.com/api/v4/projects/180/issues

curl \
  -XPUT \
  -H 'PRIVATE-TOKEN: secret' \
  -H 'Content-Type: application/json' \
  -d '{"title":"Updated","updated_at":null}' \
  https://gitlab.acme.com/api/v4/projects/180/issues/2051

Navigate to the issues page of the project or post comments with the API.

GitLab returns a 500 error.

What is the current bug behavior?

The API allows saving an invalid (?) null value as updated_at which seems to break other issue features.

What is the expected correct behavior?

The update API should fail the call with a 400 and not update any data.

-or-

The issue list page and note creation API should not break when updated_at is null.

Relevant logs and/or screenshots

production.log
Started PUT "/api/v4/projects/180/issues/2051" for 192.168.98.128 at 2019-12-12 00:11:10 +0000
NoMethodError (undefined method `-@' for nil:NilClass):
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/core_ext/time/calculations.rb:190:in `ago'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/time_with_zone.rb:309:in `rescue in -'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/time_with_zone.rb:309:in `-'
  /opt/gitlab/embedded/service/gitlab-rails/app/models/concerns/throttled_touch.rb:10:in `touch'
  /opt/gitlab/embedded/service/gitlab-rails/app/models/note.rb:480:in `touch_noteable'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `block in touch_noteable'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/method_call.rb:36:in `measure'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `touch_noteable'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/callbacks.rb:426:in `block in make_lambda'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/callbacks.rb:236:in `block in halting_and_conditional'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/callbacks.rb:517:in `block in invoke_after'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/callbacks.rb:517:in `each'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/callbacks.rb:517:in `invoke_after'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/callbacks.rb:133:in `run_callbacks'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/callbacks.rb:816:in `_run_save_callbacks'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/callbacks.rb:342:in `create_or_update'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/persistence.rb:275:in `save'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/validations.rb:46:in `save'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/transactions.rb:310:in `block (2 levels) in save'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/transactions.rb:387:in `block in with_transaction_returning_status'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/database_statements.rb:267:in `block in transaction'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/transaction.rb:239:in `block in within_new_transaction'
  /opt/gitlab/embedded/lib/ruby/2.6.0/monitor.rb:230:in `mon_synchronize'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/transaction.rb:236:in `within_new_transaction'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/database_statements.rb:267:in `transaction'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/transactions.rb:212:in `transaction'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/transactions.rb:385:in `with_transaction_returning_status'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/transactions.rb:310:in `block in save'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/transactions.rb:325:in `rollback_active_record_state!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/transactions.rb:309:in `save'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/suppressor.rb:44:in `save'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/persistence.rb:36:in `create'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/system_notes/base_service.rb:16:in `create_note'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/system_notes/issuables_service.rb:89:in `change_title'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/system_note_service.rb:165:in `change_title'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/issuable/common_system_notes_service.rb:71:in `create_title_change_note'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `block in create_title_change_note'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/method_call.rb:36:in `measure'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `create_title_change_note'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/issuable/common_system_notes_service.rb:12:in `execute'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `block in execute'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/method_call.rb:36:in `measure'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `execute'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/issuable_base_service.rb:232:in `block in update'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/no_touching.rb:31:in `apply_to'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activerecord-5.2.3/lib/active_record/no_touching.rb:24:in `no_touching'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/issuable_base_service.rb:231:in `update'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/issues/update_service.rb:17:in `update'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `block in update'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/method_call.rb:36:in `measure'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `update'
  /opt/gitlab/embedded/service/gitlab-rails/app/services/issues/update_service.rb:11:in `execute'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `block in execute'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/method_call.rb:36:in `measure'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:161:in `execute'
  /opt/gitlab/embedded/service/gitlab-rails/lib/api/issues.rb:275:in `block (2 levels) in <class:Issues>'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/endpoint.rb:57:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/endpoint.rb:57:in `block (2 levels) in generate_api_method'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/notifications.rb:170:in `instrument'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/endpoint.rb:56:in `block in generate_api_method'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/endpoint.rb:262:in `block in run'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/notifications.rb:170:in `instrument'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/endpoint.rb:243:in `run'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/endpoint.rb:313:in `block in build_stack'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/middleware/base.rb:31:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/middleware/base.rb:24:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/middleware/base.rb:31:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/middleware/base.rb:24:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/api/api_guard.rb:164:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-oauth2-1.9.3/lib/rack/oauth2/server/resource.rb:20:in `_call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-oauth2-1.9.3/lib/rack/oauth2/server/resource/bearer.rb:8:in `_call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-oauth2-1.9.3/lib/rack/oauth2/server/abstract/handler.rb:17:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/middleware/error.rb:38:in `block in call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/middleware/error.rb:37:in `catch'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/middleware/error.rb:37:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/middleware/base.rb:24:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape_logging-1.7.0/lib/grape_logging/middleware/request_logger.rb:60:in `block in call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape_logging-1.7.0/lib/grape_logging/middleware/request_logger.rb:58:in `catch'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape_logging-1.7.0/lib/grape_logging/middleware/request_logger.rb:58:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/middleware/base.rb:24:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/head.rb:12:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/endpoint.rb:227:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/endpoint.rb:221:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/router/route.rb:72:in `exec'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/router.rb:121:in `process_route'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/router.rb:74:in `block in identity'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/router.rb:93:in `transaction'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/router.rb:72:in `identity'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/router.rb:57:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/router.rb:137:in `with_optimization'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/router.rb:56:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/api.rb:119:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/api.rb:45:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/grape-1.1.0/lib/grape/api.rb:40:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/routing/mapper.rb:19:in `block in <class:Constraints>'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/routing/mapper.rb:48:in `serve'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/journey/router.rb:52:in `block in serve'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/journey/router.rb:35:in `each'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/journey/router.rb:35:in `serve'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/routing/route_set.rb:840:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/omniauth-1.9.0/lib/omniauth/strategy.rb:192:in `call!'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/omniauth-1.9.0/lib/omniauth/strategy.rb:169:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/rails_queue_duration.rb:27:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/rack_middleware.rb:17:in `block in call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/transaction.rb:62:in `run'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/rack_middleware.rb:17:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/request_profiler/middleware.rb:17:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/go.rb:20:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/etag_caching/middleware.rb:13:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/correlation_id.rb:16:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-labkit-0.7.0/lib/labkit/correlation/correlation_id.rb:18:in `use_id'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/correlation_id.rb:15:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/batch-loader-1.4.0/lib/batch_loader/middleware.rb:11:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/apollo_upload_server-2.0.0.beta.3/lib/apollo_upload_server/middleware.rb:20:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/multipart.rb:117:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-attack-6.2.0/lib/rack/attack.rb:169:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/warden-1.2.8/lib/warden/manager.rb:36:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/warden-1.2.8/lib/warden/manager.rb:34:in `catch'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/warden-1.2.8/lib/warden/manager.rb:34:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-cors-1.0.2/lib/rack/cors.rb:97:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/tempfile_reaper.rb:15:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/etag.rb:25:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/conditional_get.rb:38:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/head.rb:12:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/http/content_security_policy.rb:18:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/read_only/controller.rb:48:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/read_only.rb:18:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/session/abstract/id.rb:232:in `context'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/session/abstract/id.rb:226:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/middleware/cookies.rb:670:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/callbacks.rb:98:in `run_callbacks'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/middleware/debug_exceptions.rb:61:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/basic_health_check.rb:25:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/rack/logger.rb:38:in `call_app'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/rack/logger.rb:26:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/tagged_logging.rb:71:in `block in tagged'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/tagged_logging.rb:28:in `tagged'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/tagged_logging.rb:71:in `tagged'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/rack/logger.rb:26:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/request_context.rb:32:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/request_store-1.3.1/lib/request_store/middleware.rb:9:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/middleware/request_id.rb:27:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/method_override.rb:22:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/runtime.rb:22:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/config/initializers/fix_local_cache_middleware.rb:9:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/actionpack-5.2.3/lib/action_dispatch/middleware/executor.rb:14:in `call'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/requests_rack_middleware.rb:49:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/sendfile.rb:111:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/sentry-raven-2.9.0/lib/raven/integrations/rack.rb:51:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/engine.rb:524:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/railtie.rb:190:in `public_send'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/railtie.rb:190:in `method_missing'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/middleware/release_env.rb:12:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/urlmap.rb:68:in `block in call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/urlmap.rb:53:in `each'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/urlmap.rb:53:in `call'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:606:in `process_client'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/unicorn-worker-killer-0.4.4/lib/unicorn/worker_killer.rb:52:in `process_client'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:701:in `worker_loop'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:549:in `spawn_missing_workers'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:563:in `maintain_worker_count'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:293:in `join'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/unicorn-5.4.1/bin/unicorn:126:in `<top (required)>'
  /opt/gitlab/embedded/bin/unicorn:23:in `load'
  /opt/gitlab/embedded/bin/unicorn:23:in `<top (required)>'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/cli/exec.rb:74:in `load'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/cli/exec.rb:74:in `kernel_load'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/cli/exec.rb:28:in `run'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/cli.rb:463:in `exec'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/cli.rb:27:in `dispatch'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/cli.rb:18:in `start'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/exe/bundle:30:in `block in <top (required)>'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
  /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/bundler-1.17.3/exe/bundle:22:in `<top (required)>'
  /opt/gitlab/embedded/bin/bundle:23:in `load'
  /opt/gitlab/embedded/bin/bundle:23:in `<main>'

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info
System information
System:		
Current User:	git
Using RVM:	no
Ruby Version:	2.6.3p62
Gem Version:	2.7.9
Bundler Version:1.17.3
Rake Version:	12.3.3
Redis Version:	3.2.12
Git Version:	2.22.2
Sidekiq Version:5.2.7
Go Version:	unknown

GitLab information
Version:	12.5.4
Revision:	63af04cacf5
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	PostgreSQL
DB Version:	9.6.16
URL:		https://<redacted>.net
HTTP Clone URL:	https://<redacted>.net/some-group/some-project.git
SSH Clone URL:	ssh://git@<redacted>.net:2222/some-group/some-project.git
Using LDAP:	yes
Using Omniauth:	yes
Omniauth Providers: 

GitLab Shell
Version:	10.2.0
Repository storage paths:
- default: 	/var/opt/gitlab/git-data/repositories
GitLab Shell path:		/opt/gitlab/embedded/service/gitlab-shell
Git:		/opt/gitlab/embedded/bin/git

Possible fixes

Seems like the issue API doesn't consider that the updated_at key could be not missing, but null: https://gitlab.com/gitlab-org/gitlab/blob/master/lib%2Fapi%2Fissues.rb#L267

Edited by William Turner