unable to create forks (function lower(integer) does not exist)

This is a newly deployed instance (using object storage). What other debug info can I get?

==> /var/log/gitlab/production_json.log <== {"method":"GET","path":"/xy/linux/forks/new","format":"html","controller":"Projects::ForksController","action":"new","status":500,"error":"ActionView::Template::Error: PG::UndefinedFunction: ERROR: function lower(integer) does not exist\nLINE 1: ..."."source_type" = $1 WHERE ((LOWER(routes.path) = LOWER(546)...\n ^\nHINT: No function matches the given name and argument types. You might need to add explicit type casts.\n: SELECT "projects".* FROM "projects" INNER JOIN "routes" ON "routes"."source_id" = "projects"."id" AND "routes"."source_type" = $1 WHERE ((LOWER(routes.path) = LOWER(546))) ORDER BY (CASE WHEN routes.path = 546 THEN 0 ELSE 1 END) LIMIT 1","duration":26.88,"view":0.0,"db":5.1,"time":"2018-08-13T14:50:52.624Z","params":[{"key":"namespace_id","value":"xy"},{"key":"project_id","value":"linux"}],"remote_ip":"10.244.4.5","user_id":546,"username":"me"}

==> /var/log/gitlab/production.log <==

ActionView::Template::Error (PG::UndefinedFunction: ERROR: function lower(integer) does not exist LINE 1: ..."."source_type" = $1 WHERE ((LOWER(routes.path) = LOWER(546)... ^ HINT: No function matches the given name and argument types. You might need to add explicit type casts. : SELECT "projects".* FROM "projects" INNER JOIN "routes" ON "routes"."source_id" = "projects"."id" AND "routes"."source_type" = $1 WHERE ((LOWER(routes.path) = LOWER(546))) ORDER BY (CASE WHEN routes.path = 546 THEN 0 ELSE 1 END) LIMIT 1): 18: class: ("disabled has-tooltip" unless can_create_project), 19: title: (('You have reached your project limit') unless can_create_project) do 20: - if /no((\w*)_)*avatar/.match(avatar) 21: = project_icon(namespace, class: "avatar s100 identicon") 22: - else 23: .avatar-container.s100 24: = image_tag(avatar, class: "avatar s100") app/models/concerns/routable.rb:50:in find_by_full_path' app/helpers/avatars_helper.rb:116:in source_icon' app/helpers/avatars_helper.rb:3:in project_icon' app/views/projects/forks/_fork_button.html.haml:21:in block in _app_views_projects_forks__fork_button_html_haml___2925269400606822670_46995058807240' app/views/projects/forks/_fork_button.html.haml:16:in _app_views_projects_forks__fork_button_html_haml___2925269400606822670_46995058807240' app/views/projects/forks/new.html.haml:17:in block in _app_views_projects_forks_new_html_haml___1023091398450606455_46995060656220' app/views/projects/forks/new.html.haml:16:in each' app/views/projects/forks/new.html.haml:16:in _app_views_projects_forks_new_html_haml___1023091398450606455_46995060656220' lib/gitlab/i18n.rb:51:in with_locale' lib/gitlab/i18n.rb:57:in with_user_locale' app/controllers/application_controller.rb:401:in set_locale' lib/gitlab/middleware/multipart.rb:97:in call' lib/gitlab/request_profiler/middleware.rb:14:in call' lib/gitlab/middleware/go.rb:17:in call' lib/gitlab/etag_caching/middleware.rb:11:in call' lib/gitlab/middleware/rails_queue_duration.rb:22:in call' lib/gitlab/metrics/rack_middleware.rb:15:in block in call' lib/gitlab/metrics/transaction.rb:53:in run' lib/gitlab/metrics/rack_middleware.rb:15:in call' lib/gitlab/middleware/read_only/controller.rb:38:in call' lib/gitlab/middleware/read_only.rb:16:in call' lib/gitlab/middleware/basic_health_check.rb:25:in call' lib/gitlab/request_context.rb:18:in call' lib/gitlab/metrics/requests_rack_middleware.rb:27:in call' lib/gitlab/middleware/release_env.rb:10:in `call'