stack level too deep in simple captcha plugin for ruby on rails

I am using Simple Captcha plugin in my application. The application was running fine from last two months but recently (last two days) it is giving error "stack level too deep" while saving the user into for "@user.save_with_captcha" line. The error occurs only in Production environment. In development mode, everything works fine. After digging the code, I found that it is going in infinite loop for "save_without_captcha"

The error details : 
SystemStackError (stack level too deep):
  app/controllers/logins_controller.rb:205:in `sign_up_user'
  passenger (2.2.15) lib/phusion_passenger/rack/request_handler.rb:92:in `process_request'
  passenger (2.2.15) lib/phusion_passenger/abstract_request_handler.rb:207:in `main_loop'
  passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:441:in `start_request_handler'
  passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:381:in `handle_spawn_application'
  passenger (2.2.15) lib/phusion_passenger/utils.rb:252:in `safe_fork'
  passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:377:in `handle_spawn_application'
  passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in `__send__'
  passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in `main_loop'
  passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
  passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:163:in `start'
  passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:222:in `start'
  passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:253:in `spawn_rails_application'
  passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:126:in `lookup_or_add'
  passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:247:in `spawn_rails_application'
  passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:80:in `synchronize'
  passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
  passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:246:in `spawn_rails_application'
  passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:145:in `spawn_application'
  passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:278:in `handle_spawn_application'
  passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in `__send__'
  passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in `main_loop'
  passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously'

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stack level too deep in simple captcha plugin for ruby on rails

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