docker/cli · error

URL is nil

Error message

URL is nil

What it means

Error "URL is nil" thrown in docker/cli.

Source

Thrown at cli/connhelper/ssh/ssh.go:40

		return nil, fmt.Errorf("invalid SSH URL: %w", err)
	}
	return NewSpec(u)
}

// NewSpec creates a [Spec] from the given ssh URL's properties. It returns
// an error if the URL is using the wrong scheme, contains fragments,
// query-parameters, or contains a password.
func NewSpec(sshURL *url.URL) (*Spec, error) {
	s, err := newSpec(sshURL)
	if err != nil {
		return nil, fmt.Errorf("invalid SSH URL: %w", err)
	}
	return s, nil
}

func newSpec(u *url.URL) (*Spec, error) {
	if u == nil {
		return nil, errors.New("URL is nil")
	}
	if u.Scheme == "" {
		return nil, errors.New("no scheme provided")
	}
	if u.Scheme != "ssh" {
		return nil, errors.New("incorrect scheme: " + u.Scheme)
	}

	var sp Spec

	if u.User != nil {
		sp.User = u.User.Username()
		if _, ok := u.User.Password(); ok {
			return nil, errors.New("plain-text password is not supported")
		}
	}
	sp.Host = u.Hostname()
	if sp.Host == "" {

View on GitHub (pinned to e9452d6e78)

When it happens

Trigger: Thrown at cli/connhelper/ssh/ssh.go:40 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of docker/cli@e9452d6e78 (2026-08-01). Data as JSON: /data/errors/1a4f41da81e3d810.json. Report an issue: GitHub.