It’s sadly related to:
Rails log
Started GET "/post_action_users?id= 512345&post_action_type_id=2" for <clientIp> at 2022-04-09 16:57:10 +0000
Processing by PostActionUsersController#index as JSON
Parameters: {"id"=>"512345", "post_action_type_id"=>"2"}
Completed 500 Internal Server Error in 23ms (ActiveRecord: 0.0ms | Allocations: 8877)
NoMethodError (undefined method `feedbacks' for nil:NilClass)
(eval):12:in `_fast_attributes'
app/controllers/application_controller.rb:497:in `serialize_data'
app/controllers/post_action_users_controller.rb:41:in `index'
app/controllers/application_controller.rb:400:in `block in with_resolved_locale'
app/controllers/application_controller.rb:400: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:358: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'
So not related to anything in the main solution.
I’ll jump to the other thread dedicated to the plugin.