Intenté registrarme con una invitación y finalmente me arrojó un error de servidor interno 
Con el siguiente error en /logs
Información
ActiveRecord::NotNullViolation (PG::NotNullViolation: ERROR: valor nulo en la columna "encrypt_pms_default" de la relación "user_options" viola la restricción de no nulo
DETALLE: Fila fallida contiene (5333, f, t, t, t, f, t, 10080, 300000, 2880, null, 2, f, 1, 1, f, 2, 0, t, null, {}, f, 0, 0, 1, 0, 0, f, null, f, null, f, null, 0, null, t, null, null, null, null, 3, null, 1, f, null, 0, null).
)
app/models/user.rb:1734:in `create_user_option'
app/models/invite_redeemer.rb:142:in `create_user_from_invite'
app/models/invite_redeemer.rb:208:in `invited_user'
app/models/invite_redeemer.rb:260:in `add_user_to_groups'
app/models/invite_redeemer.rb:226:in `process_invitation'
app/models/invite_redeemer.rb:55:in `block in redeem'
app/models/invite_redeemer.rb:53:in `redeem'
app/models/invite.rb:227:in `redeem'
app/controllers/invites_controller.rb:227:in `perform_accept_invitation'
app/controllers/application_controller.rb:413:in `block in with_resolved_locale'
app/controllers/application_controller.rb:413:in `with_resolved_locale'
lib/middleware/omniauth_bypass_middleware.rb:71:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:368:in `call'
config/initializers/008-rack-cors.rb:25:in `call'
config/initializers/100-quiet_logger.rb:23:in `call'
config/initializers/100-silence_logger.rb:31:in `call'
lib/middleware/enforce_hostname.rb:23:in `call'
lib/middleware/request_tracker.rb:202:in `call'
Rastreo
rack-mini-profiler (3.0.0) lib/patches/db/pg.rb:69:in `exec_params'
rack-mini-profiler (3.0.0) lib/patches/db/pg.rb:69:in `exec_params'
activerecord (7.0.3.1) lib/active_record/connection_adapters/postgresql_adapter.rb:768:in `block (2 levels) in exec_no_cache'
activesupport (7.0.3.1) lib/active_support/concurrency/share_lock.rb:187:in `yield_shares'
activesupport (7.0.3.1) lib/active_support/dependencies/interlock.rb:41:in `permit_concurrent_loads'
activerecord (7.0.3.1) lib/active_record/connection_adapters/postgresql_adapter.rb:767:in `block in exec_no_cache'
activesupport (7.0.3.1) lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
activesupport (7.0.3.1) lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
activesupport (7.0.3.1) lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
activesupport (7.0.3.1) lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract_adapter.rb:765:in `block in log'
activesupport (7.0.3.1) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract_adapter.rb:756:in `log'
activerecord (7.0.3.1) lib/active_record/connection_adapters/postgresql_adapter.rb:766:in `exec_no_cache'
activerecord (7.0.3.1) lib/active_record/connection_adapters/postgresql_adapter.rb:745:in `execute_and_clear'
activerecord (7.0.3.1) lib/active_record/connection_adapters/postgresql/database_statements.rb:54:in `exec_query'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract/database_statements.rb:132:in `exec_insert'
activerecord (7.0.3.1) lib/active_record/connection_adapters/postgresql/database_statements.rb:92:in `exec_insert'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract/database_statements.rb:167:in `insert'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract/query_cache.rb:22:in `insert'
activerecord (7.0.3.1) lib/active_record/persistence.rb:496:in `_insert_record'
activerecord (7.0.3.1) lib/active_record/persistence.rb:1096:in `_create_record'
activerecord (7.0.3.1) lib/active_record/counter_cache.rb:166:in `_create_record'
activerecord (7.0.3.1) lib/active_record/locking/optimistic.rb:79:in `_create_record'
activerecord (7.0.3.1) lib/active_record/attribute_methods/dirty.rb:222:in `_create_record'
activerecord (7.0.3.1) lib/active_record/callbacks.rb:461:in `block in _create_record'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:107:in `run_callbacks'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:929:in `_run_create_callbacks'
activerecord (7.0.3.1) lib/active_record/callbacks.rb:461:in `_create_record'
activerecord (7.0.3.1) lib/active_record/timestamp.rb:108:in `_create_record'
activerecord (7.0.3.1) lib/active_record/persistence.rb:1067:in `create_or_update'
activerecord (7.0.3.1) lib/active_record/callbacks.rb:457:in `block in create_or_update'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:107:in `run_callbacks'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:929:in `_run_save_callbacks'
activerecord (7.0.3.1) lib/active_record/callbacks.rb:457:in `create_or_update'
activerecord (7.0.3.1) lib/active_record/timestamp.rb:126:in `create_or_update'
activerecord (7.0.3.1) lib/active_record/persistence.rb:648:in `save!'
activerecord (7.0.3.1) lib/active_record/validations.rb:53:in `save!'
activerecord (7.0.3.1) lib/active_record/transactions.rb:302:in `block in save!'
activerecord (7.0.3.1) lib/active_record/transactions.rb:354:in `block in with_transaction_returning_status'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract/database_statements.rb:314:in `transaction'
activerecord (7.0.3.1) lib/active_record/transactions.rb:350:in `with_transaction_returning_status'
activerecord (7.0.3.1) lib/active_record/transactions.rb:302:in `save!'
activerecord (7.0.3.1) lib/active_record/suppressor.rb:54:in `save!'
activerecord (7.0.3.1) lib/active_record/persistence.rb:55:in `create!'
app/models/user.rb:1734:in `create_user_option'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:400:in `block in make_lambda'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:236:in `block in halting_and_conditional'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:599:in `block in invoke_after'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:599:in `each'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:599:in `invoke_after'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:108:in `run_callbacks'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:929:in `_run_create_callbacks'
activerecord (7.0.3.1) lib/active_record/callbacks.rb:461:in `_create_record'
activerecord (7.0.3.1) lib/active_record/timestamp.rb:108:in `_create_record'
activerecord (7.0.3.1) lib/active_record/persistence.rb:1067:in `create_or_update'
activerecord (7.0.3.1) lib/active_record/callbacks.rb:457:in `block in create_or_update'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:118:in `block in run_callbacks'
activerecord (7.0.3.1) lib/active_record/autosave_association.rb:370:in `around_save_collection_association'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:127:in `block in run_callbacks'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:138:in `run_callbacks'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:929:in `_run_save_callbacks'
activerecord (7.0.3.1) lib/active_record/callbacks.rb:457:in `create_or_update'
activerecord (7.0.3.1) lib/active_record/timestamp.rb:126:in `create_or_update'
activerecord (7.0.3.1) lib/active_record/persistence.rb:648:in `save!'
activerecord (7.0.3.1) lib/active_record/validations.rb:53:in `save!'
activerecord (7.0.3.1) lib/active_record/transactions.rb:302:in `block in save!'
activerecord (7.0.3.1) lib/active_record/transactions.rb:354:in `block in with_transaction_returning_status'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract/database_statements.rb:314:in `transaction'
activerecord (7.0.3.1) lib/active_record/transactions.rb:350:in `with_transaction_returning_status'
activerecord (7.0.3.1) lib/active_record/transactions.rb:302:in `save!'
activerecord (7.0.3.1) lib/active_record/suppressor.rb:54:in `save!'
app/models/invite_redeemer.rb:142:in `create_user_from_invite'
app/models/invite_redeemer.rb:208:in `invited_user'
app/models/invite_redeemer.rb:260:in `add_user_to_groups'
app/models/invite_redeemer.rb:226:in `process_invitation'
app/models/invite_redeemer.rb:55:in `block in redeem'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract/transaction.rb:319:in `block in within_new_transaction'
activesupport (7.0.3.1) lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
activesupport (7.0.3.1) lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
activesupport (7.0.3.1) lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
activesupport (7.0.3.1) lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract/transaction.rb:317:in `within_new_transaction'
activerecord (7.0.3.1) lib/active_record/connection_adapters/abstract/database_statements.rb:316:in `transaction'
activerecord (7.0.3.1) lib/active_record/transactions.rb:209:in `transaction'
app/models/invite_redeemer.rb:53:in `redeem'
app/models/invite.rb:227:in `redeem'
app/controllers/invites_controller.rb:227:in `perform_accept_invitation'
actionpack (7.0.3.1) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack (7.0.3.1) lib/abstract_controller/base.rb:215:in `process_action'
actionpack (7.0.3.1) lib/action_controller/metal/rendering.rb:53:in `process_action'
actionpack (7.0.3.1) lib/abstract_controller/callbacks.rb:234:in `block in process_action'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:118:in `block in run_callbacks'
app/controllers/application_control
Lo cual probablemente esté relacionado con el plugin Discourse Encrypt (para mensajes privados); fue una actualización hace 12 días, así que cuando actualicé el sitio por primera vez ayer, este también se actualizó.
Este plugin está instalado en mi sitio, pero está desactivado. Voy a comentar la línea en app.yml y ver cómo funciona.