Bug - Wizard - Clicking on parent step crashes when first sub-step is hidden

[ochosi]

Describe the problem
When a Wizard has a parent step with sub-steps where the first sub-step is hidden (isHidden={true}), clicking on the parent step in the navigation causes the application to crash with:

Uncaught TypeError: can't access property "status", activeStep is undefined

How do you reproduce the problem?

1. Create a Wizard with a parent step containing multiple sub-steps
2. Set isHidden={true} on the first sub-step
3. Navigate past the parent step to a later step
4. Click on the parent step in the navigation

<Wizard>
  <WizardStep id="step-1" name="Step 1" />
  <WizardStep
    id="step-2"
    name="Parent Step"
    steps={[
      <WizardStep id="sub-1" name="Hidden Sub Step" isHidden={true} />,
      <WizardStep id="sub-2" name="Visible Sub Step" />,
    ]}
  />
  <WizardStep id="step-3" name="Step 3" />
</Wizard>

Navigate to "Step 3", then click on "Parent Step" → crash

The downstream issue also has a description on how to reproduce the problem with cockpit-image-builder in Fedora: osbuild/image-builder-frontend#3909

Expected behavior
Clicking on the parent step should navigate to the first visible sub-step (sub-2 in the example above).

Is this issue blocking you?
We could work around this problem downstream, here's a potential fix: https://github.com/ochosi/image-builder-frontend/tree/fix-wizard-crash

Screenshots
See the downstream issue for a screenshot: osbuild/image-builder-frontend#3909

What is your environment?

• OS: Fedora 43
• Browser: Firefox
• Version: 145

What is your product and what release date are you targeting?

cockpit-image-builder is targeting RHEL 10.2, so Jan 2026.

Any other information?