Bug - Alert group toast demo broken link

[srambach]

Describe the problem
From notification drawer link on the alert group toast demo, you get an error page:
Error: Minified React error #130; visit https://reactjs.org/docs/error-decoder.html?invariant=130&args[]=undefined&args[]= for the full message or use the non-minified dev environment for full errors and additional helpful warnings.

How do you reproduce the problem?
Go to this demo
Click to show several alert toasts.
Click the link to show the notification drawer.

Expected behavior
I assume it should show a notification drawer on the page? But if we don't have that part of the demo we should at least make it so you don't get an error.