When using apipie (e.g. FAM, ...) or getting the apidoc manually with curl, the Foreman GUI is broken afterwards.

This is the error I see in the web interface:

undefined method `minutes' for nil:NilClass

  def set_activity_time
    session[:expires_at] = Setting[:idle_timeout].minutes.from_now.to_i
  end

  def expire_session

This is the error in the logs:

13:24:17 rails.1   | 2021-08-13T13:24:17 [I|app|c58e4354] Started GET "/users/login" for ::1 at 2021-08-13 13:24:17 +0200
13:24:17 rails.1   | 2021-08-13T13:24:17 [I|app|c58e4354] Processing by UsersController#login as HTML
[...]
13:24:17 rails.1   | 2021-08-13T13:24:17 [I|app|c58e4354]   Rendering users/login.html.erb within layouts/login
13:24:17 rails.1   | 2021-08-13T13:24:17 [W|app|c58e4354] Setting is not initialized yet, requested value for login_text will be always nil
13:24:17 rails.1   | 2021-08-13T13:24:17 [I|app|c58e4354]   Rendered common/_login.html.erb (Duration: 1.8ms | Allocations: 194)
13:24:17 rails.1   | 2021-08-13T13:24:17 [I|app|c58e4354]   Rendered users/login.html.erb within layouts/login (Duration: 20.0ms | Allocations: 1309)
13:24:17 rails.1   | 2021-08-13T13:24:17 [I|app|c58e4354]   Rendering layouts/base.html.erb
13:24:17 rails.1   | 2021-08-13T13:24:17 [W|app|c58e4354] Setting is not initialized yet, requested value for http_proxy will be always nil
[...]
13:24:17 rails.1   | 2021-08-13T13:24:17 [W|app|c58e4354] Setting is not initialized yet, requested value for http_proxy will be always nil
13:24:17 rails.1   | 2021-08-13T13:24:17 [I|app|c58e4354]   Rendered layouts/base.html.erb (Duration: 141.7ms | Allocations: 43896)
13:24:17 rails.1   | 2021-08-13T13:24:17 [W|app|c58e4354] Setting is not initialized yet, requested value for idle_timeout will be always nil
13:24:17 rails.1   | 2021-08-13T13:24:17 [I|app|c58e4354] Completed 500 Internal Server Error in 186ms (Views: 174.3ms | ActiveRecord: 1.9ms | Allocations: 48832)
13:24:17 rails.1   |  c58e4354 |
13:24:17 rails.1   |  c58e4354 |
13:24:17 rails.1   | 2021-08-13T13:24:17 [F|app|c58e4354]
13:24:17 rails.1   |  c58e4354 | NoMethodError (undefined method `minutes' for nil:NilClass):
13:24:17 rails.1   |  c58e4354 |
13:24:17 rails.1   |  c58e4354 | app/controllers/concerns/foreman/controller/session.rb:29:in `set_activity_time'
13:24:17 rails.1   |  c58e4354 | app/controllers/concerns/foreman/controller/session.rb:25:in `update_activity_time'
13:24:17 rails.1   |  c58e4354 | app/controllers/concerns/foreman/controller/timezone.rb:10:in `set_timezone'
13:24:17 rails.1   |  c58e4354 | app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
13:24:17 rails.1   |  c58e4354 | app/controllers/concerns/foreman/controller/topbar_sweeper.rb:12:in `set_topbar_sweeper_controller'
13:24:17 rails.1   |  c58e4354 | lib/foreman/middleware/telemetry.rb:10:in `call'
13:24:17 rails.1   |  c58e4354 | lib/foreman/middleware/catch_json_parse_errors.rb:9:in `call'
13:24:17 rails.1   |  c58e4354 | lib/foreman/middleware/logging_context_session.rb:22:in `call'
13:24:17 rails.1   |  c58e4354 | lib/foreman/middleware/logging_context_request.rb:11:in `call'

• Checkout 2.5-stable branch of Foreman
• Run migrations/seeding against an empty DB
• Start Foreman
• Check the web interface -> still working / login is possible
• Run curl http://localhost:5000/apidoc/v2.json
• Check the web interface again -> will be broken now

Environment:
- Foreman 2.5.2 (branch `2.5-stable`)