TypeError in ConfigService when LoadAdditionalScriptsEvent fires on pages without a logged-in user (e.g. Nextcloud Talk recording page) – breaks recording feature entirely

Bug description

integration_paperless registers a listener for OCP\Collaboration\Resources\LoadAdditionalScriptsEvent, which fires on any page rendering that event – including anonymous/guest pages where no user is logged in. In that case $userId is null, but ConfigService::__construct() requires a string, causing an uncaught TypeError that breaks the entire page request.

This became especially critical because it silently breaks the Nextcloud Talk call recording feature: the recording page (/call/{token}/recording) is rendered as a PublicTemplateResponse for an anonymous participant, without any indication in the browser/network response other than a failed JS execution (OCA.Talk is undefined), making this extremely hard to diagnose. It caused several unresolved reports in the Talk/AIO community for this exact symptom (see e.g. nextcloud/all-in-one#3276 and help.nextcloud.com/t/talk-recording-not-working/223577), where the actual root cause was this exception, not Talk/AIO/network/reverse proxy configuration.

Steps to reproduce

1. Install integration_paperless (v1.0.13) alongside Nextcloud Talk with recording enabled
2. Start a call and start a recording
3. The recording fails with "contact your administrator"

Expected behavior

The recording page loads normally and OCA.Talk is initialized correctly.

Actual behavior

Uncaught TypeError in nextcloud.log:

OCA\Paperless\Service\ConfigService::__construct(): Argument #2 ($userId) must be of type string, null given
in file '/var/www/html/custom_apps/integration_paperless/lib/Service/ConfigService.php' line 14

Triggered via:

PageController.php(351): OC\EventDispatcher\EventDispatcher->dispatchTyped(LoadAdditionalScriptsEvent)
→ ServiceEventListener->__invoke(...)
→ OCA\Paperless\Listener\FileActionListener
→ OCA\Paperless\Service\ConfigService::__construct($userConfig, null)

This causes the entire request (/index.php/call/{token}/recording) to fail server-side, which in turn breaks the JS on the page (no OCA.Talk object), which breaks the Selenium-based recording bot in nextcloud-aio-talk-recording.

Environment

• Nextcloud Server: 33.0.6.2
• Nextcloud Talk (spreed): 23.0.9
• integration_paperless: 1.0.13
• Deployment: Nextcloud AIO on Unraid, Cloudflare Tunnel reverse proxy (confirmed not proxy/network related — issue reproduces identically via direct internal connection)

Suggested fix

FileActionListener/ConfigService should handle a null $userId gracefully (e.g. skip registering the file action, or make the constructor parameter nullable) instead of throwing on any anonymous/guest page load.

Start with lib/Listener/FileActionListener and lib/Service/ConfigService, then reproduce the LoadAdditionalScriptsEvent on an anonymous or guest page. Trace how the null user ID reaches ConfigService::__construct(). Done means anonymous page requests no longer throw a TypeError and the Talk recording page loads with OCA.Talk initialized.