v15.8 Getting OpenSSL::Cipher::CipherError and 500 errror while /admin/application_settings/general#js-signup-settings

When I use V15.8 (Admin Area>General>Sign-up restrictions) to setup sign-up disabled ,there’s 500 error happen, the logs shows:

OpenSSL::Cipher::CipherError ():

lib/gitlab/database/load_balancing/connection_proxy.rb:120:in block in write_using_load_balancer' lib/gitlab/database/load_balancing/load_balancer.rb:129:in block in read_write' lib/gitlab/database/load_balancing/load_balancer.rb:200:in retry_with_backoff' lib/gitlab/database/load_balancing/load_balancer.rb:118:in read_write' lib/gitlab/database/load_balancing/connection_proxy.rb:119:in write_using_load_balancer' lib/gitlab/database/load_balancing/connection_proxy.rb:71:in transaction' app/services/application_settings/update_service.rb:50:in update_settings' app/services/application_settings/update_service.rb:12:in execute' app/controllers/admin/application_settings_controller.rb:289:in perform_update' app/controllers/admin/application_settings_controller.rb:55:in block (2 levels) in <class:ApplicationSettingsContro app/controllers/application_controller.rb:534:in set_current_admin' lib/gitlab/session.rb:11:in with_session' app/controllers/application_controller.rb:525:in set_session_storage' lib/gitlab/i18n.rb:107:in with_locale' lib/gitlab/i18n.rb:113:in with_user_locale' app/controllers/application_controller.rb:513:in set_locale' app/controllers/application_controller.rb:507:in set_current_context' lib/gitlab/metrics/elasticsearch_rack_middleware.rb:16:in call' lib/gitlab/middleware/memory_report.rb:13:in call' lib/gitlab/middleware/speedscope.rb:13:in call' lib/gitlab/database/load_balancing/rack_middleware.rb:23:in call' lib/gitlab/middleware/rails_queue_duration.rb:33:in call' lib/gitlab/metrics/rack_middleware.rb:16:in block in call' lib/gitlab/metrics/web_transaction.rb:46:in run' lib/gitlab/metrics/rack_middleware.rb:16:in call' lib/gitlab/jira/middleware.rb:19:in call' lib/gitlab/middleware/go.rb:20:in call' lib/gitlab/etag_caching/middleware.rb:21:in call' lib/gitlab/middleware/query_analyzer.rb:11:in block in call' lib/gitlab/database/query_analyzer.rb:37:in within' lib/gitlab/middleware/query_analyzer.rb:11:in call' lib/gitlab/middleware/multipart.rb:173:in call' lib/gitlab/middleware/read_only/controller.rb:50:in call' lib/gitlab/middleware/read_only.rb:18:in call' lib/gitlab/middleware/same_site_cookies.rb:27:in call' lib/gitlab/middleware/handle_malformed_strings.rb:21:in call' lib/gitlab/middleware/basic_health_check.rb:25:in call' lib/gitlab/middleware/handle_ip_spoof_attack_error.rb:25:in call' lib/gitlab/middleware/request_context.rb:21:in call' lib/gitlab/middleware/webhook_recursion_detection.rb:15:in call' config/initializers/fix_local_cache_middleware.rb:11:in call' lib/gitlab/middleware/compressed_json.rb:37:in call' lib/gitlab/middleware/rack_multipart_tempfile_factory.rb:19:in call' lib/gitlab/middleware/sidekiq_web_static.rb:20:in call' lib/gitlab/metrics/requests_rack_middleware.rb:77:in call' lib/gitlab/middleware/release_env.rb:13:in call'

then I command in gitlab-rails c : settings = ApplicationSetting.last settings.update_column(:runners_registration_token_encrypted, nil)

it has no effect...

Anything how can I do again?****