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Error 500 When Trying to Access /admin/application_settings after upgrading from 12.4.6 to 12.5.4

Summary

I get an Error 500 when trying to access /admin/application_settings after upgrading from 12.4.6 to 12.5.4

Steps to reproduce

Try to Access /admin/application_settings

Example Project

On-prem instance.

What is the current bug behavior?

Returns error 500

What is the expected correct behavior?

Loads the /admin/application_settings page

Relevant logs and/or screenshots

Processing by Explore::ProjectsController#trending as HTML
Completed 200 OK in 32ms (Views: 20.6ms | ActiveRecord: 3.2ms | Elasticsearch: 0.0ms)
Started GET "/admin/application_settings" for xx.xxx.xx.xx at 2019-12-13 10:27:06 +0000
Processing by Admin::ApplicationSettingsController#show as HTML
Completed 500 Internal Server Error in 353ms (ActiveRecord: 18.2ms | Elasticsearch: 0.0ms)

ActionView::Template::Error (undefined method `remove_source_branch_after_merge=' for #<Project id: >
Did you mean?  remote_mirror_available_overridden_change):
    11:     = render_if_exists 'admin/application_settings/default_project_deletion_protection_setting', form: f
    12:     .form-group.visibility-level-setting
    13:       = f.label :default_project_visibility, class: 'label-bold'
    14:       = render('shared/visibility_radios', model_method: :default_project_visibility, form: f, selected_level: @application_setting.default_project_visibility, form_model: Project.new)
    15:     .form-group.visibility-level-setting
    16:       = f.label :default_snippet_visibility, class: 'label-bold'
    17:       = render('shared/visibility_radios', model_method: :default_snippet_visibility, form: f, selected_level: @application_setting.default_snippet_visibility, form_model: ProjectSnippet.new)

app/models/project.rb:645:in `initialize'
lib/gitlab/metrics/instrumentation.rb:161:in `block in initialize'
lib/gitlab/metrics/method_call.rb:36:in `measure'
lib/gitlab/metrics/instrumentation.rb:161:in `initialize'
app/views/admin/application_settings/_visibility_and_access.html.haml:14:in `block in _app_views_admin_application_settings__visibility_and_access_html_haml__401875350527911971_69878286249100'
app/views/admin/application_settings/_visibility_and_access.html.haml:1:in `_app_views_admin_application_settings__visibility_and_access_html_haml__401875350527911971_69878286249100'
app/views/admin/application_settings/general.html.haml:14:in `_app_views_admin_application_settings_general_html_haml__3367447124785056118_69878121421220'
app/controllers/application_controller.rb:108:in `render'
app/controllers/admin/application_settings_controller.rb:18:in `show'
lib/gitlab/session.rb:11:in `with_session'
app/controllers/application_controller.rb:450:in `set_session_storage'
lib/gitlab/i18n.rb:55:in `with_locale'
lib/gitlab/i18n.rb:61:in `with_user_locale'
app/controllers/application_controller.rb:444:in `set_locale'
lib/gitlab/middleware/rails_queue_duration.rb:27:in `call'
lib/gitlab/metrics/rack_middleware.rb:17:in `block in call'
lib/gitlab/metrics/transaction.rb:62:in `run'
lib/gitlab/metrics/rack_middleware.rb:17:in `call'
lib/gitlab/request_profiler/middleware.rb:17:in `call'
lib/gitlab/middleware/go.rb:20:in `call'
lib/gitlab/etag_caching/middleware.rb:13:in `call'
lib/gitlab/middleware/correlation_id.rb:16:in `block in call'
lib/gitlab/middleware/correlation_id.rb:15:in `call'
lib/gitlab/middleware/multipart.rb:117:in `call'
lib/gitlab/middleware/read_only/controller.rb:48:in `call'
lib/gitlab/middleware/read_only.rb:18:in `call'
lib/gitlab/middleware/basic_health_check.rb:25:in `call'
lib/gitlab/request_context.rb:32:in `call'
config/initializers/fix_local_cache_middleware.rb:9:in `call'
lib/gitlab/metrics/requests_rack_middleware.rb:49:in `call'
lib/gitlab/middleware/release_env.rb:12:in `call'

Output of checks

This bug happens on on-prem test installation.

Results of GitLab environment info

Expand for output related to GitLab environment info 
System information
System:
Current User:	git
Using RVM:	no
Ruby Version:	2.6.3p62
Gem Version:	2.7.9
Bundler Version:1.17.3
Rake Version:	12.3.3
Redis Version:	3.2.12
Git Version:	2.22.2
Sidekiq Version:5.2.7
Go Version:	unknown
rake aborted!
NoMethodError: undefined method `remove_source_branch_after_merge=' for #
Did you mean?  remote_mirror_available_overridden_change
/opt/gitlab/embedded/service/gitlab-rails/app/models/project.rb:645:in `initialize'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/info.rake:48:in `block (3 levels) in '
/opt/gitlab/embedded/bin/bundle:23:in `load'
/opt/gitlab/embedded/bin/bundle:23:in `'
Tasks: TOP => gitlab:env:info

Results of GitLab application Check

Expand for output related to the GitLab application check 
Checking GitLab subtasks ...


Checking GitLab Shell ...


GitLab Shell: ... GitLab Shell version >= 10.2.0 ? ... OK (10.2.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful


Checking GitLab Shell ... Finished


Checking Gitaly ...


Gitaly: ... default ... OK


Checking Gitaly ... Finished


Checking Sidekiq ...


Sidekiq: ... Running? ... yes
Number of Sidekiq processes ... 1


Checking Sidekiq ... Finished


Checking Incoming Email ...


Incoming Email: ... Reply by email is disabled in config/gitlab.yml


Checking Incoming Email ... Finished


Checking LDAP ...


LDAP: ... Server: ldapmain
LDAP authentication... Success
LDAP users with access to your GitLab server (only showing the first 100 results)
User output sanitized. Found 100 users of 100 limit.


Checking LDAP ... Finished


Checking GitLab App ...


Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... skipped (no tmp uploads folder yet)
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ... can't check, you have no projects
Redis version >= 2.8.0? ... yes
Ruby version >= 2.5.3 ? ... yes (2.6.3)
Git version >= 2.22.0 ? ... yes (2.22.2)
Git user has default SSH configuration? ... yes
Active users: ... 2
Is authorized keys file accessible? ... yes


Checking GitLab App ... Finished


Checking GitLab subtasks ... Finished