Selecting Add New Site results in blank blue page

[TPilgs]

Quick summary

Been able to replicate when SU'd, but unable to replicate on my tests. A user is attempting to select Add New Site from their switch sites menu and it only loads a blue page.

This link appears: https://wordpress.com/start/domains?ref=calypso-selector&source=my-home&siteSlug=null

Removing the &siteSlug=null fixes the issues as a workaround.

Steps to reproduce

1. Open up the Switch Sites menu
2. Select the option to add new site
3. It pops up with a blue screen and no links or options.

What you expected to happen

It should bring up the create new site workflow.

What actually happened

It shows a blank page, but it's intermittent depending on who has tried it.

Context

{5655440}-zen is the one that brought the issue up and the one that, if SU'd, doesn't work for me or a few others.

Slack thread here:

{p1666629795505489}-slack-{wpcomsupport}

Platform (Simple, Atomic, or both?)

Simple, Atomic

Theme-specific issue?

N/A

Browser, operating system and other notes

We've tried on updated versions of Chrome and Firefox.

Reproducibility

Intermittent

Severity

Most (> 50%)

Available workarounds?

Yes, easy to implement

Workaround details

Removing the &siteSlug=null fixes the issues as a workaround, but the user(s) likely won't know this unless they reach out to us.

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Support References

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• [ ] -zen