# NoMethodError

undefined method `first' for nil:NilClass

- **Location:** app/models/color.rb:7
- **Occurred at:** 2026-05-13 19:03:37 UTC

## Backtrace

### Compact Trace

```
app/models/color.rb:7:in `black_or_white_rgb'
app/controllers/api/v1/climbing_sessions_controller.rb:113:in `block in friends_climbing_sessions'
app/controllers/api/v1/climbing_sessions_controller.rb:105:in `map'
app/controllers/api/v1/climbing_sessions_controller.rb:105:in `friends_climbing_sessions'
```

### Full Trace

```
/var/www/oblyk/api/releases/20260429165115/app/models/color.rb:7:in `black_or_white_rgb'
/var/www/oblyk/api/releases/20260429165115/app/controllers/api/v1/climbing_sessions_controller.rb:113:in `block in friends_climbing_sessions'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activerecord-6.0.3.6/lib/active_record/relation/delegation.rb:87:in `each'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activerecord-6.0.3.6/lib/active_record/relation/delegation.rb:87:in `each'
/var/www/oblyk/api/releases/20260429165115/app/controllers/api/v1/climbing_sessions_controller.rb:105:in `map'
/var/www/oblyk/api/releases/20260429165115/app/controllers/api/v1/climbing_sessions_controller.rb:105:in `friends_climbing_sessions'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/abstract_controller/base.rb:195:in `process_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_controller/metal/rendering.rb:30:in `process_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/abstract_controller/callbacks.rb:42:in `block in process_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/callbacks.rb:112:in `block in run_callbacks'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rorvswild-1.6.0/lib/rorvswild/plugin/action_controller.rb:28:in `around_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/callbacks.rb:121:in `instance_exec'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/callbacks.rb:121:in `block in run_callbacks'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/callbacks.rb:139:in `run_callbacks'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/abstract_controller/callbacks.rb:41:in `process_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_controller/metal/rescue.rb:22:in `process_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_controller/metal/instrumentation.rb:33:in `block in process_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/notifications.rb:180:in `block in instrument'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/notifications/instrumenter.rb:24:in `instrument'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/notifications.rb:180:in `instrument'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_controller/metal/instrumentation.rb:32:in `process_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activerecord-6.0.3.6/lib/active_record/railties/controller_runtime.rb:27:in `process_action'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/abstract_controller/base.rb:136:in `process'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_controller/metal.rb:190:in `dispatch'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_controller/metal.rb:254:in `dispatch'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/routing/route_set.rb:33:in `serve'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/journey/router.rb:49:in `block in serve'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/journey/router.rb:32:in `each'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/journey/router.rb:32:in `serve'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/routing/route_set.rb:834:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rack-2.2.3/lib/rack/session/abstract/id.rb:266:in `context'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rack-2.2.3/lib/rack/session/abstract/id.rb:260:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/cookies.rb:648:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rack-2.2.3/lib/rack/etag.rb:27:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rack-2.2.3/lib/rack/conditional_get.rb:27:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rack-2.2.3/lib/rack/head.rb:12:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/callbacks.rb:101:in `run_callbacks'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/actionable_exceptions.rb:18:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/railties-6.0.3.6/lib/rails/rack/logger.rb:37:in `call_app'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/railties-6.0.3.6/lib/rails/rack/logger.rb:26:in `block in call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/tagged_logging.rb:80:in `block in tagged'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/tagged_logging.rb:28:in `tagged'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/tagged_logging.rb:80:in `tagged'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/railties-6.0.3.6/lib/rails/rack/logger.rb:26:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/request_store-1.5.0/lib/request_store/middleware.rb:19:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/request_id.rb:27:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rack-2.2.3/lib/rack/runtime.rb:22:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/activesupport-6.0.3.6/lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/executor.rb:14:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rack-2.2.3/lib/rack/sendfile.rb:110:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/ssl.rb:74:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/actionpack-6.0.3.6/lib/action_dispatch/middleware/host_authorization.rb:76:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rack-cors-1.1.1/lib/rack/cors.rb:100:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/rorvswild-1.6.0/lib/rorvswild/plugin/middleware.rb:20:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/railties-6.0.3.6/lib/rails/engine.rb:527:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/puma-4.3.7/lib/puma/configuration.rb:228:in `call'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/puma-4.3.7/lib/puma/server.rb:713:in `handle_request'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/puma-4.3.7/lib/puma/server.rb:472:in `process_client'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/puma-4.3.7/lib/puma/server.rb:328:in `block in run'
/var/www/oblyk/api/shared/bundle/ruby/2.6.0/gems/puma-4.3.7/lib/puma/thread_pool.rb:134:in `block in spawn_thread'
```

## Request

- **Name:** Api::V1::ClimbingSessionsController#friends_climbing_sessions
- **Method:** GET
- **URL:** https://api.oblyk.org/api/v1/current_users/climbing_sessions/friends_climbing_sessions.json?page=1
- **Browser:** Safari 18

## Parameters

```json
{
  "page": "1",
  "action": "friends_climbing_sessions",
  "format": "json",
  "controller": "api/v1/climbing_sessions"
}
```

## Headers

| Header | Value |
|--------|-------|
| Host | api.oblyk.org |
| Accept | application/json, text/plain, */* |
| Cf-Ray | 9fb3ec68efa6d915-CDG |
| Origin | https://oblyk.org |
| Referer | https://oblyk.org/ |
| Version | HTTP/1.0 |
| Cdn-Loop | cloudflare; loops=1 |
| Priority | u=3, i |
| Cf-Visitor | {"scheme":"https"} |
| Connection | close |
| User-Agent | Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Mobile/15E148 Safari/604.1 PWAShell |
| Cf-Ipcountry | FR |
| Authorization | [FILTERED] |
| Sec-Fetch-Dest | empty |
| Sec-Fetch-Mode | cors |
| Sec-Fetch-Site | same-site |
| Accept-Encoding | gzip, br |
| Accept-Language | fr-FR,fr;q=0.9 |
| X-Forwarded-For | 2a0d:e487:41ef:409a:29c7:4ac9:2cdb:ef88, 172.68.151.142 |
| Cf-Connecting-Ip | 2a0d:e487:41ef:409a:29c7:4ac9:2cdb:ef88 |
| X-Forwarded-Proto | https |
| Httpapiaccesstoken | [FILTERED] |

## Environment

| Variable | Value |
|----------|-------|
| os | Linux 5.10.0-14-cloud-amd64 |
| cwd | /var/www/oblyk/api/releases/20260429165115 |
| pid | 419874 |
| host | oblyk-api |
| ruby | ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-linux] |
| user | oblyk |
| rails | 6.0.3.6 |
| revision | eb9561400ef42ca61271ea8c114e690a4003b8f2
 |


[View on RoRvsWild ↗](https://www.rorvswild.com/applications/135627/errors/88463408)