Encoding::CompatibilityError: incompatible character encodings: UTF-8 and ASCII-8BIT

https://sentry.gitlap.com/gitlab/gitlabcom/issues/107188/

Encoding::CompatibilityError: incompatible character encodings: UTF-8 and ASCII-8BIT
  app/views/layouts/application.html.haml:9:in `_app_views_layouts_application_html_haml___1016265776262982579_69835580554260'
    
  app/views/layouts/search.html.haml:4:in `_app_views_layouts_search_html_haml___3233451300287741276_69834675129900'
    = render template: "layouts/application"
  lib/gitlab/i18n.rb:47:in `with_locale'
    yield
  lib/gitlab/i18n.rb:53:in `with_user_locale'
    with_locale(user&.preferred_language, &block)
  app/controllers/application_controller.rb:332:in `set_locale'
    Gitlab::I18n.with_user_locale(current_user, &block)
...
(162 additional frame(s) were not displayed)

Encoding::CompatibilityError: incompatible character encodings: UTF-8 and ASCII-8BIT