Exception in Grape instruments

[curtis]

We're seeing an exception with one of our Grape endpoints after adding Scout APM. This exception does not happen in the development environment, when SCOUT_MONITOR is false, or when Grape instruments are disabled in scout_apm.yml. For now, we have followed the instructions to disable Grape instrumentation as noted in this issue.

Gem Versions

Rails 6.1.7.8
Grape 2.1.3
Scout 5.3.8

Backtrace

/gems/grape-2.1.3/lib/grape/middleware/error.rb:82 in rescue_handler_for_base_only_class
/gems/grape-2.1.3/lib/grape/middleware/error.rb:59 in find_handler
/gems/grape-2.1.3/lib/grape/middleware/error.rb:36 in rescue in call!
/gems/grape-2.1.3/lib/grape/middleware/error.rb:32 in call!
/gems/grape-2.1.3/lib/grape/middleware/base.rb:27 in call
/gems/rack-2.2.9/lib/rack/head.rb:12 in call
/gems/grape-2.1.3/lib/grape/endpoint.rb:225 in call!
/gems/grape-2.1.3/lib/grape/endpoint.rb:219 in call
/gems/grape-2.1.3/lib/grape/router/route.rb:19 in exec
/gems/grape-2.1.3/lib/grape/router.rb:121 in process_route
/gems/grape-2.1.3/lib/grape/router.rb:68 in block in identity
/gems/grape-2.1.3/lib/grape/router.rb:101 in transaction
/gems/grape-2.1.3/lib/grape/router.rb:66 in identity
/gems/grape-2.1.3/lib/grape/router.rb:50 in block in call
/gems/grape-2.1.3/lib/grape/router.rb:137 in with_optimization
/gems/grape-2.1.3/lib/grape/router.rb:49 in call
/gems/grape-2.1.3/lib/grape/api/instance.rb:164 in call
/gems/grape-2.1.3/lib/grape/api/instance.rb:68 in call!
/gems/grape-2.1.3/lib/grape/api/instance.rb:63 in call
/gems/grape-2.1.3/lib/grape/api.rb:78 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/routing/mapper.rb:20 in block in <class:Constraints>
/gems/actionpack-6.1.7.8/lib/action_dispatch/routing/mapper.rb:49 in serve
/gems/actionpack-6.1.7.8/lib/action_dispatch/journey/router.rb:50 in block in serve
/gems/actionpack-6.1.7.8/lib/action_dispatch/journey/router.rb:32 in each
/gems/actionpack-6.1.7.8/lib/action_dispatch/journey/router.rb:32 in serve
/gems/actionpack-6.1.7.8/lib/action_dispatch/routing/route_set.rb:842 in call
/gems/scout_apm-5.3.8/lib/scout_apm/instruments/rails_router.rb:29 in call_with_scout_instruments
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:202 in call!
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:169 in call
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:202 in call!
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:169 in call
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:202 in call!
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:169 in call
/gems/dragonfly-1.4.0/lib/dragonfly/middleware.rb:14 in call
/gems/scout_apm-5.3.8/lib/scout_apm/middleware.rb:17 in call
/gems/rack-attack-6.7.0/lib/rack/attack.rb:103 in call
/gems/warden-1.2.9/lib/warden/manager.rb:36 in block in call
/gems/warden-1.2.9/lib/warden/manager.rb:34 in catch
/gems/warden-1.2.9/lib/warden/manager.rb:34 in call
/gems/rack-2.2.9/lib/rack/tempfile_reaper.rb:15 in call
/gems/rack-2.2.9/lib/rack/etag.rb:27 in call
/gems/rack-2.2.9/lib/rack/conditional_get.rb:27 in call
/gems/rack-2.2.9/lib/rack/head.rb:12 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/http/permissions_policy.rb:22 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/http/content_security_policy.rb:19 in call
/gems/rack-2.2.9/lib/rack/session/abstract/id.rb:266 in context
/gems/rack-2.2.9/lib/rack/session/abstract/id.rb:260 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/cookies.rb:697 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/callbacks.rb:27 in block in call
/gems/activesupport-6.1.7.8/lib/active_support/callbacks.rb:98 in run_callbacks
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/callbacks.rb:26 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/actionable_exceptions.rb:18 in call
/gems/airbrake-13.0.4/lib/airbrake/rack/middleware.rb:34 in call!
/gems/airbrake-13.0.4/lib/airbrake/rack/middleware.rb:23 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/debug_exceptions.rb:29 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/show_exceptions.rb:33 in call
/gems/turbolinks_render-0.9.21/lib/turbolinks_render/middleware.rb:81 in call
/gems/lograge-0.13.0/lib/lograge/rails_ext/rack/logger.rb:18 in call_app
/gems/railties-6.1.7.8/lib/rails/rack/logger.rb:26 in block in call
/gems/activesupport-6.1.7.8/lib/active_support/tagged_logging.rb:99 in block in tagged
/gems/activesupport-6.1.7.8/lib/active_support/tagged_logging.rb:37 in tagged
/gems/activesupport-6.1.7.8/lib/active_support/tagged_logging.rb:99 in tagged
/gems/railties-6.1.7.8/lib/rails/rack/logger.rb:26 in call
/gems/sprockets-rails-3.5.2/lib/sprockets/rails/quiet_assets.rb:17 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/remote_ip.rb:81 in call
/gems/request_store-1.7.0/lib/request_store/middleware.rb:19 in call
/gems/rack-timeout-0.6.3/lib/rack/timeout/core.rb:148 in block in call
/gems/rack-timeout-0.6.3/lib/rack/timeout/support/timeout.rb:19 in timeout
/gems/rack-timeout-0.6.3/lib/rack/timeout/core.rb:147 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/request_id.rb:26 in call
/gems/rack-2.2.9/lib/rack/method_override.rb:24 in call
/gems/rack-2.2.9/lib/rack/runtime.rb:22 in call
/gems/activesupport-6.1.7.8/lib/active_support/cache/strategy/local_cache_middleware.rb:29 in call
/gems/rack-rewrite-1.5.1/lib/rack/rewrite.rb:24 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/executor.rb:14 in call
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:141 in forward
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:267 in fetch
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:196 in lookup
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:67 in call!
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:52 in call
/gems/rack-2.2.9/lib/rack/deflater.rb:44 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/static.rb:24 in call
/gems/dragonfly-1.4.0/lib/dragonfly/cookie_monster.rb:9 in call
/gems/rack-2.2.9/lib/rack/sendfile.rb:110 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/ssl.rb:77 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/host_authorization.rb:142 in call
/gems/scout_apm-5.3.8/lib/scout_apm/instruments/middleware_summary.rb:58 in call
/gems/railties-6.1.7.8/lib/rails/engine.rb:539 in call
/gems/puma-6.4.2/lib/puma/configuration.rb:272 in call
/gems/puma-6.4.2/lib/puma/request.rb:100 in block in handle_request
/gems/puma-6.4.2/lib/puma/thread_pool.rb:378 in with_force_shutdown
/gems/puma-6.4.2/lib/puma/request.rb:99 in handle_request
/gems/puma-6.4.2/lib/puma/server.rb:464 in process_client
/gems/puma-6.4.2/lib/puma/server.rb:245 in block in run
/gems/puma-6.4.2/lib/puma/thread_pool.rb:155 in block in spawn_thread
Caused by NameError: undefined local variable or method `logger' for #<Class:0x000055b3ccd8dfd0> in `/api/:version/static_options' endpoint
/gems/scout_apm-5.3.8/lib/scout_apm/instruments/grape.rb:56 in rescue in run_with_scout_instruments
/gems/scout_apm-5.3.8/lib/scout_apm/instruments/grape.rb:48 in run_with_scout_instruments
/gems/grape-2.1.3/lib/grape/endpoint.rb:317 in block in build_stack
/gems/grape-2.1.3/lib/grape/middleware/base.rb:34 in call!
/gems/grape-2.1.3/lib/grape/middleware/base.rb:27 in call
/gems/grape-2.1.3/lib/grape/middleware/base.rb:34 in call!
/gems/grape-2.1.3/lib/grape/middleware/base.rb:27 in call
/gems/grape-2.1.3/lib/grape/middleware/error.rb:34 in block in call!
/gems/grape-2.1.3/lib/grape/middleware/error.rb:34 in catch
/gems/grape-2.1.3/lib/grape/middleware/error.rb:34 in call!
/gems/grape-2.1.3/lib/grape/middleware/base.rb:27 in call
/gems/rack-2.2.9/lib/rack/head.rb:12 in call
/gems/grape-2.1.3/lib/grape/endpoint.rb:225 in call!
/gems/grape-2.1.3/lib/grape/endpoint.rb:219 in call
/gems/grape-2.1.3/lib/grape/router/route.rb:19 in exec
/gems/grape-2.1.3/lib/grape/router.rb:121 in process_route
/gems/grape-2.1.3/lib/grape/router.rb:68 in block in identity
/gems/grape-2.1.3/lib/grape/router.rb:101 in transaction
/gems/grape-2.1.3/lib/grape/router.rb:66 in identity
/gems/grape-2.1.3/lib/grape/router.rb:50 in block in call
/gems/grape-2.1.3/lib/grape/router.rb:137 in with_optimization
/gems/grape-2.1.3/lib/grape/router.rb:49 in call
/gems/grape-2.1.3/lib/grape/api/instance.rb:164 in call
/gems/grape-2.1.3/lib/grape/api/instance.rb:68 in call!
/gems/grape-2.1.3/lib/grape/api/instance.rb:63 in call
/gems/grape-2.1.3/lib/grape/api.rb:78 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/routing/mapper.rb:20 in block in <class:Constraints>
/gems/actionpack-6.1.7.8/lib/action_dispatch/routing/mapper.rb:49 in serve
/gems/actionpack-6.1.7.8/lib/action_dispatch/journey/router.rb:50 in block in serve
/gems/actionpack-6.1.7.8/lib/action_dispatch/journey/router.rb:32 in each
/gems/actionpack-6.1.7.8/lib/action_dispatch/journey/router.rb:32 in serve
/gems/actionpack-6.1.7.8/lib/action_dispatch/routing/route_set.rb:842 in call
/gems/scout_apm-5.3.8/lib/scout_apm/instruments/rails_router.rb:29 in call_with_scout_instruments
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:202 in call!
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:169 in call
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:202 in call!
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:169 in call
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:202 in call!
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:169 in call
/gems/dragonfly-1.4.0/lib/dragonfly/middleware.rb:14 in call
/gems/scout_apm-5.3.8/lib/scout_apm/middleware.rb:17 in call
/gems/rack-attack-6.7.0/lib/rack/attack.rb:103 in call
/gems/warden-1.2.9/lib/warden/manager.rb:36 in block in call
/gems/warden-1.2.9/lib/warden/manager.rb:34 in catch
/gems/warden-1.2.9/lib/warden/manager.rb:34 in call
/gems/rack-2.2.9/lib/rack/tempfile_reaper.rb:15 in call
/gems/rack-2.2.9/lib/rack/etag.rb:27 in call
/gems/rack-2.2.9/lib/rack/conditional_get.rb:27 in call
/gems/rack-2.2.9/lib/rack/head.rb:12 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/http/permissions_policy.rb:22 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/http/content_security_policy.rb:19 in call
/gems/rack-2.2.9/lib/rack/session/abstract/id.rb:266 in context
/gems/rack-2.2.9/lib/rack/session/abstract/id.rb:260 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/cookies.rb:697 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/callbacks.rb:27 in block in call
/gems/activesupport-6.1.7.8/lib/active_support/callbacks.rb:98 in run_callbacks
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/callbacks.rb:26 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/actionable_exceptions.rb:18 in call
/gems/airbrake-13.0.4/lib/airbrake/rack/middleware.rb:34 in call!
/gems/airbrake-13.0.4/lib/airbrake/rack/middleware.rb:23 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/debug_exceptions.rb:29 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/show_exceptions.rb:33 in call
/gems/turbolinks_render-0.9.21/lib/turbolinks_render/middleware.rb:81 in call
/gems/lograge-0.13.0/lib/lograge/rails_ext/rack/logger.rb:18 in call_app
/gems/railties-6.1.7.8/lib/rails/rack/logger.rb:26 in block in call
/gems/activesupport-6.1.7.8/lib/active_support/tagged_logging.rb:99 in block in tagged
/gems/activesupport-6.1.7.8/lib/active_support/tagged_logging.rb:37 in tagged
/gems/activesupport-6.1.7.8/lib/active_support/tagged_logging.rb:99 in tagged
/gems/railties-6.1.7.8/lib/rails/rack/logger.rb:26 in call
/gems/sprockets-rails-3.5.2/lib/sprockets/rails/quiet_assets.rb:17 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/remote_ip.rb:81 in call
/gems/request_store-1.7.0/lib/request_store/middleware.rb:19 in call
/gems/rack-timeout-0.6.3/lib/rack/timeout/core.rb:148 in block in call
/gems/rack-timeout-0.6.3/lib/rack/timeout/support/timeout.rb:19 in timeout
/gems/rack-timeout-0.6.3/lib/rack/timeout/core.rb:147 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/request_id.rb:26 in call
/gems/rack-2.2.9/lib/rack/method_override.rb:24 in call
/gems/rack-2.2.9/lib/rack/runtime.rb:22 in call
/gems/activesupport-6.1.7.8/lib/active_support/cache/strategy/local_cache_middleware.rb:29 in call
/gems/rack-rewrite-1.5.1/lib/rack/rewrite.rb:24 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/executor.rb:14 in call
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:141 in forward
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:267 in fetch
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:196 in lookup
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:67 in call!
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:52 in call
/gems/rack-2.2.9/lib/rack/deflater.rb:44 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/static.rb:24 in call
/gems/dragonfly-1.4.0/lib/dragonfly/cookie_monster.rb:9 in call
/gems/rack-2.2.9/lib/rack/sendfile.rb:110 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/ssl.rb:77 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/host_authorization.rb:142 in call
/gems/scout_apm-5.3.8/lib/scout_apm/instruments/middleware_summary.rb:58 in call
/gems/railties-6.1.7.8/lib/rails/engine.rb:539 in call
/gems/puma-6.4.2/lib/puma/configuration.rb:272 in call
/gems/puma-6.4.2/lib/puma/request.rb:100 in block in handle_request
/gems/puma-6.4.2/lib/puma/thread_pool.rb:378 in with_force_shutdown
/gems/puma-6.4.2/lib/puma/request.rb:99 in handle_request
/gems/puma-6.4.2/lib/puma/server.rb:464 in process_client
/gems/puma-6.4.2/lib/puma/server.rb:245 in block in run
/gems/puma-6.4.2/lib/puma/thread_pool.rb:155 in block in spawn_thread
Caused by NoMethodError: undefined method `first' for nil:NilClass
/gems/scout_apm-5.3.8/lib/scout_apm/instruments/grape.rb:50 in run_with_scout_instruments
/gems/grape-2.1.3/lib/grape/endpoint.rb:317 in block in build_stack
/gems/grape-2.1.3/lib/grape/middleware/base.rb:34 in call!
/gems/grape-2.1.3/lib/grape/middleware/base.rb:27 in call
/gems/grape-2.1.3/lib/grape/middleware/base.rb:34 in call!
/gems/grape-2.1.3/lib/grape/middleware/base.rb:27 in call
/gems/grape-2.1.3/lib/grape/middleware/error.rb:34 in block in call!
/gems/grape-2.1.3/lib/grape/middleware/error.rb:34 in catch
/gems/grape-2.1.3/lib/grape/middleware/error.rb:34 in call!
/gems/grape-2.1.3/lib/grape/middleware/base.rb:27 in call
/gems/rack-2.2.9/lib/rack/head.rb:12 in call
/gems/grape-2.1.3/lib/grape/endpoint.rb:225 in call!
/gems/grape-2.1.3/lib/grape/endpoint.rb:219 in call
/gems/grape-2.1.3/lib/grape/router/route.rb:19 in exec
/gems/grape-2.1.3/lib/grape/router.rb:121 in process_route
/gems/grape-2.1.3/lib/grape/router.rb:68 in block in identity
/gems/grape-2.1.3/lib/grape/router.rb:101 in transaction
/gems/grape-2.1.3/lib/grape/router.rb:66 in identity
/gems/grape-2.1.3/lib/grape/router.rb:50 in block in call
/gems/grape-2.1.3/lib/grape/router.rb:137 in with_optimization
/gems/grape-2.1.3/lib/grape/router.rb:49 in call
/gems/grape-2.1.3/lib/grape/api/instance.rb:164 in call
/gems/grape-2.1.3/lib/grape/api/instance.rb:68 in call!
/gems/grape-2.1.3/lib/grape/api/instance.rb:63 in call
/gems/grape-2.1.3/lib/grape/api.rb:78 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/routing/mapper.rb:20 in block in <class:Constraints>
/gems/actionpack-6.1.7.8/lib/action_dispatch/routing/mapper.rb:49 in serve
/gems/actionpack-6.1.7.8/lib/action_dispatch/journey/router.rb:50 in block in serve
/gems/actionpack-6.1.7.8/lib/action_dispatch/journey/router.rb:32 in each
/gems/actionpack-6.1.7.8/lib/action_dispatch/journey/router.rb:32 in serve
/gems/actionpack-6.1.7.8/lib/action_dispatch/routing/route_set.rb:842 in call
/gems/scout_apm-5.3.8/lib/scout_apm/instruments/rails_router.rb:29 in call_with_scout_instruments
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:202 in call!
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:169 in call
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:202 in call!
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:169 in call
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:202 in call!
/gems/omniauth-2.1.2/lib/omniauth/strategy.rb:169 in call
/gems/dragonfly-1.4.0/lib/dragonfly/middleware.rb:14 in call
/gems/scout_apm-5.3.8/lib/scout_apm/middleware.rb:17 in call
/gems/rack-attack-6.7.0/lib/rack/attack.rb:103 in call
/gems/warden-1.2.9/lib/warden/manager.rb:36 in block in call
/gems/warden-1.2.9/lib/warden/manager.rb:34 in catch
/gems/warden-1.2.9/lib/warden/manager.rb:34 in call
/gems/rack-2.2.9/lib/rack/tempfile_reaper.rb:15 in call
/gems/rack-2.2.9/lib/rack/etag.rb:27 in call
/gems/rack-2.2.9/lib/rack/conditional_get.rb:27 in call
/gems/rack-2.2.9/lib/rack/head.rb:12 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/http/permissions_policy.rb:22 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/http/content_security_policy.rb:19 in call
/gems/rack-2.2.9/lib/rack/session/abstract/id.rb:266 in context
/gems/rack-2.2.9/lib/rack/session/abstract/id.rb:260 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/cookies.rb:697 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/callbacks.rb:27 in block in call
/gems/activesupport-6.1.7.8/lib/active_support/callbacks.rb:98 in run_callbacks
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/callbacks.rb:26 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/actionable_exceptions.rb:18 in call
/gems/airbrake-13.0.4/lib/airbrake/rack/middleware.rb:34 in call!
/gems/airbrake-13.0.4/lib/airbrake/rack/middleware.rb:23 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/debug_exceptions.rb:29 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/show_exceptions.rb:33 in call
/gems/turbolinks_render-0.9.21/lib/turbolinks_render/middleware.rb:81 in call
/gems/lograge-0.13.0/lib/lograge/rails_ext/rack/logger.rb:18 in call_app
/gems/railties-6.1.7.8/lib/rails/rack/logger.rb:26 in block in call
/gems/activesupport-6.1.7.8/lib/active_support/tagged_logging.rb:99 in block in tagged
/gems/activesupport-6.1.7.8/lib/active_support/tagged_logging.rb:37 in tagged
/gems/activesupport-6.1.7.8/lib/active_support/tagged_logging.rb:99 in tagged
/gems/railties-6.1.7.8/lib/rails/rack/logger.rb:26 in call
/gems/sprockets-rails-3.5.2/lib/sprockets/rails/quiet_assets.rb:17 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/remote_ip.rb:81 in call
/gems/request_store-1.7.0/lib/request_store/middleware.rb:19 in call
/gems/rack-timeout-0.6.3/lib/rack/timeout/core.rb:148 in block in call
/gems/rack-timeout-0.6.3/lib/rack/timeout/support/timeout.rb:19 in timeout
/gems/rack-timeout-0.6.3/lib/rack/timeout/core.rb:147 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/request_id.rb:26 in call
/gems/rack-2.2.9/lib/rack/method_override.rb:24 in call
/gems/rack-2.2.9/lib/rack/runtime.rb:22 in call
/gems/activesupport-6.1.7.8/lib/active_support/cache/strategy/local_cache_middleware.rb:29 in call
/gems/rack-rewrite-1.5.1/lib/rack/rewrite.rb:24 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/executor.rb:14 in call
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:141 in forward
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:267 in fetch
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:196 in lookup
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:67 in call!
/gems/rack-cache-1.14.0/lib/rack/cache/context.rb:52 in call
/gems/rack-2.2.9/lib/rack/deflater.rb:44 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/static.rb:24 in call
/gems/dragonfly-1.4.0/lib/dragonfly/cookie_monster.rb:9 in call
/gems/rack-2.2.9/lib/rack/sendfile.rb:110 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/ssl.rb:77 in call
/gems/actionpack-6.1.7.8/lib/action_dispatch/middleware/host_authorization.rb:142 in call
/gems/scout_apm-5.3.8/lib/scout_apm/instruments/middleware_summary.rb:58 in call
/gems/railties-6.1.7.8/lib/rails/engine.rb:539 in call
/gems/puma-6.4.2/lib/puma/configuration.rb:272 in call
/gems/puma-6.4.2/lib/puma/request.rb:100 in block in handle_request
/gems/puma-6.4.2/lib/puma/thread_pool.rb:378 in with_force_shutdown
/gems/puma-6.4.2/lib/puma/request.rb:99 in handle_request
/gems/puma-6.4.2/lib/puma/server.rb:464 in process_client
/gems/puma-6.4.2/lib/puma/server.rb:245 in block in run
/gems/puma-6.4.2/lib/puma/thread_pool.rb:155 in block in spawn_thread

[lancetarn]

Sorry for the trouble. I think I see the issue, which looks like it is masking another issue, so this will be a double bonus. Thanks for the library info; we'll try to get a repro going.