Subscriptions: Investigate potential fatal

[kraftbj]

Impacted plugin

Jetpack

Steps to Reproduce

• Unverified, but setup a local testing site with a tunnel. While tunneling with the public domain, set up the site inclusive of the subscriptions module.
• Then, access the site via https://localhost
• Open the post editor and start to write a post.

A clear and concise description of what you expected to happen.

No fatals.

What actually happened

[12-Sep-2022 18:55:45 UTC] PHP Fatal error:  Uncaught Error: Class "Jetpack_Subscriptions_Widget" not found in /usr/local/src/jetpack-monorepo/projects/plugins/jetpack/_inc/lib/core-api/wpcom-endpoints/subscribers.php:67

Browser

No response

Other information

My guess is something with Developer mode disabling the subscriptions module, but either a block always expects it or doesn't realize it won't ba available, and the rest endpoint class doesn't sufficiently ensure the class is available before trying to use it.

Platform (Simple, Atomic, or both?)

No response

Reproducibility

Consistent

Severity

One

Available workarounds?

No response

Workaround details

No response

[iandunn]

I'm seeing this on various sites in a production Multisite too, so there may be additional causes beyond offline mode. I'll wait and see if installing v11.4 fixes it, though 👍🏻

E_ERROR: Uncaught Error: Class 'Jetpack_Subscriptions_Widget' not found in /wp-content/plugins/jetpack/_inc/lib/core-api/wpcom-endpoints/subscribers.php:67
URL: https://kolkata.wordcamp.org/2022/wp-json/wpcom/v2/subscribers/count?_locale=user
Referer: https://kolkata.wordcamp.org/2022/wp-admin/post.php?post=653&action=edit&classic-editor__forget

[katiebethbrown]

Reopening as we've run into this on a Team51 site.

In our case the site has a Subscription block in the Footer widget area. The site was cloned, and the clone had a Site connection but no Account connection. Without the Account connection we get the fatal. Removing the Subscription block or creating the Account connection resolves the fatal, but I'd expected it to fail gracefully.

I can reliably replicate on a Jurassic Ninja site as well. If I setup the Jetpack connection (Site and Account), add a subscribe block in a widget and then break the Account connection I get the fatal:

Fatal error: Uncaught Error: Class "Jetpack_Subscriptions_Widget" not found in /srv/users/usere8d75201/apps/usere8d75201/public/wp-content/plugins/jetpack/extensions/blocks/subscriptions/subscriptions.php:451

[jeherve]

@katiebethbrown Good catch, thanks a lot for the reproduction steps! I opened #31635 to take care of that.