ActionView::Template::Error: Absolute URI missing hierarchical segment

https://sentry.gitlab.net/gitlab/gitlabcom/issues/640022/

Addressable::URI::InvalidURIError: Absolute URI missing hierarchical segment: 
  addressable/uri.rb:2412:in `validate'
    raise InvalidURIError,
  addressable/uri.rb:2357:in `defer_validation'
    validate
  addressable/uri.rb:796:in `initialize'
    self.defer_validation do
  addressable/uri.rb:136:in `new'
    return new(
  addressable/uri.rb:136:in `parse'
    return new(