ActionView::Template::Error: undefined method `email' for nil:NilClass

https://sentry.gitlab.net/gitlab/gitlabcom/issues/2448049/?referrer=gitlab_plugin

NoMethodError: undefined method `email' for nil:NilClass
  /opt/gitlab/embedded/service/gitlab-rails/ee/app/views/projects/requirements_management/requirements/index.html.haml:32:in `_ee_app_views_projects_requirements_management_requirements_index_html_haml__2739410290827211389_23994420'
    current_user_email: current_user.email,
  action_view/base.rb:274:in `_run'
    send(method, locals, buffer, &block)
  action_view/template.rb:185:in `block in render'
    view._run(method_name, self, locals, buffer, &block)
  active_support/notifications.rb:182:in `instrument'
    yield payload if block_given?
  action_view/template.rb:385:in `instrument_render_template'
    ActiveSupport::Notifications.instrument("!render_template.action_view", instrument_payload, &block)
...
(179 additional frame(s) were not displayed)

ActionView::Template::Error: undefined method `email' for nil:NilClass