charmbracelet/crush · error

failed to get last assistant message: %w

Error message

failed to get last assistant message: %w

What it means

restoreModelFromSession reads the last assistant message via app.Messages.GetLastAssistantMessage to restore provider/model on --continue/--last runs. sql.ErrNoRows is treated as success (nothing to restore), but any other DB error is wrapped with this message. It indicates a storage failure while fetching session history.

Source

Thrown at internal/app/app.go:459

	if app.AgentCoordinator == nil {
		return fmt.Errorf("agent configuration is missing")
	}
	return app.AgentCoordinator.UpdateModels(ctx)
}

// restoreModelFromSession reads the last assistant message in the
// session and, if it used a different provider/model than the current
// config, overrides the preferred model in-memory (non-persistent)
// provided the provider/model is still available. This ensures that
// continuing a session uses the same model that produced the last
// response.
func (app *App) restoreModelFromSession(ctx context.Context, sessionID string) error {
	lastMsg, err := app.Messages.GetLastAssistantMessage(ctx, sessionID)
	if err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			return nil
		}
		return fmt.Errorf("failed to get last assistant message: %w", err)
	}
	if lastMsg.Provider == "" || lastMsg.Model == "" {
		return nil
	}

	cfg := app.config.Config()
	currentLarge := cfg.Models[config.SelectedModelTypeLarge]
	if currentLarge.Provider == lastMsg.Provider && currentLarge.Model == lastMsg.Model {
		return nil
	}

	if !cfg.IsModelAvailable(lastMsg.Provider, lastMsg.Model) {
		slog.Debug("Skipping model restoration: provider/model not available",
			"provider", lastMsg.Provider,
			"model", lastMsg.Model)
		return nil
	}

View on GitHub (pinned to 7944b8e522)

Solutions

1. Check the SQLite DB file is readable and the disk has space
2. Move the corrupt DB aside so a fresh one is created
3. Run crush once with SLOG_LEVEL=debug to identify the migration/query failure
4. Reinstall/upgrade crush if migrations are out of sync with the DB version

if _, err := os.Stat(dbPath); err != nil {
	return fmt.Errorf("session DB missing/corrupt: %s", dbPath)
}
// only continue sessions that actually have history
if !sessionHasAssistantMessages(sessionID) {
	// proceed without restore — crush treats ErrNoRows as no-op
}

if err := app.RunNonInteractive(ctx, w, prompt, "", "", true, contID, useLast); err != nil {
	if strings.Contains(err.Error(), "failed to get last assistant message") {
		return fmt.Errorf("session history unreadable; start a new session: %w", err)
	}
	return err
}

When it happens

Trigger: GetLastAssistantMessage returns a non-ErrNoRows error: SQLite file unreadable/corrupt, table missing (failed migration), or context cancelled during the query.

Common situations: Corrupted cache DB; running with a read-only data directory; schema mismatch after downgrading crush; disk-full during query.

Related errors

• failed to create session for non-interactive mode: %w
• failed to get session: %w
• failed to save todos: %w
• error creating file history: %w
• failed to resolve session: %w

AI-assisted analysis of charmbracelet/crush@7944b8e522 (2026-08-29). Data as JSON: /api/errors/489b431147fd64b0. Report an issue: GitHub.