Opening the Sign In portlet's Configuration iframe throws "window.parent is null" JavaScript error

• Type: Regression Bug
• Status: Closed
• Resolution: No Longer Reproducible
• Affects Version/s: 7.0.0 Alpha 2
• Fix Version/s: 6.2.X EE, 7.0.X EE, Master
• Component/s: Application Security, Application Security > Login/Sign in Portlet
• Labels:
  • EXP7
• Story Points: 1
• Fix Priority: 3

Steps to reproduce:

1. Login
2. Navigate to the Sign In portlet's Configuration

Expected result:
No JavaScript errors will be thrown.

Actual result:
window.parent is null is thrown in the browser.