Exception":"Error","Message":"Call to a member function xpath() on bool

Describe the bug
When opening an ODS file, there's a spinning circle and eventually a timeout occurs.

To Reproduce
Steps to reproduce the behavior:

1. Create an ODS file offline
2. Let the server sync
3. Try to open it using the web UI
4. See error

Expected behavior
Spreadsheet should open w/o issues

Screenshots

Client details:

• OS: Reproducible on Ubuntu 24.04 and OSX 14.6.1
• Browser: Opera 112.0.5197.53 and Firefox 129

Server details

Operating system: Debian Bookworm

Web server: Apache 2.4.61-1~deb12u1

Database: Postgresql 15.8-0+deb12u1

PHP version: 8.2.20-1~deb12u1

Nextcloud version: 29.0.4

Version of the richdocuments app 8.4.4

Version of Collabora Online How do I verify this?

Configuration of the richdocuments app

{
    "apps": {
        "richdocuments": {
            "disable_certificate_verification": "yes",
            "public_wopi_url": "https:\/\/linuxinlaws.eu\/nextcloud\/apps\/richdocumentscode\/proxy.php?req=",
            "installed_version": "8.4.4",
            "enabled": "yes",
            "types": "prevent_group_restriction",
            "wopi_url": "http:\/\/linuxinlaws.eu\/apps\/richdocumentscode\/proxy.php?req="
        }
    }
}

Nextcloud log (data/nextcloud.log)

{"reqId":"HX3d8psLdlyu4oHdJldw","level":3,"time":"2024-08-10T06:42:47+00:00","remoteAddr":"79.219.166.209","user":"<user>","app":"index","method":"POST","url":"/nextcloud/index.php/apps/richdocuments/token","message":"Call to a member function xpath() on bool in file '/var/www/nextcloud/apps/richdocuments/lib/WOPI/Parser.php' line 56","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 OPR/112.0.0.0","version":"29.0.4.1","exception":{"Exception":"Exception","Message":"Call to a member function xpath() on bool in file '/var/www/nextcloud/apps/richdocuments/lib/WOPI/Parser.php' line 56","Code":0,"Trace":[{"file":"/var/www/nextcloud/lib/private/AppFramework/App.php","line":184,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":338,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/nextcloud/lib/base.php","line":1050,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/index.php","line":49,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","Line":170,"Previous":{"Exception":"Error","Message":"Call to a member function xpath() on bool","Code":0,"Trace":[{"file":"/var/www/nextcloud/apps/richdocuments/lib/WOPI/Parser.php","line":39,"function":"getUrlSrc","class":"OCA\\Richdocuments\\WOPI\\Parser","type":"->"},{"file":"/var/www/nextcloud/apps/richdocuments/lib/TokenManager.php","line":326,"function":"getUrlSrcValue","class":"OCA\\Richdocuments\\WOPI\\Parser","type":"->"},{"file":"/var/www/nextcloud/apps/richdocuments/lib/Controller/DocumentController.php","line":389,"function":"getUrlSrc","class":"OCA\\Richdocuments\\TokenManager","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":232,"function":"token","class":"OCA\\Richdocuments\\Controller\\DocumentController","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":138,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/App.php","line":184,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":338,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/nextcloud/lib/base.php","line":1050,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/index.php","line":49,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/nextcloud/apps/richdocuments/lib/WOPI/Parser.php","Line":56},"message":"Call to a member function xpath() on bool in file '/var/www/nextcloud/apps/richdocuments/lib/WOPI/Parser.php' line 56","exception":{},"CustomMessage":"Call to a member function xpath() on bool in file '/var/www/nextcloud/apps/richdocuments/lib/WOPI/Parser.php' line 56"}}<user>

More than happy to provide additional input if required.

Reproduce the ODS opening flow and inspect apps/richdocuments/lib/WOPI/Parser.php around lines 39 and 56, where the xpath() failure is reported. Trace the call through TokenManager.php and DocumentController.php, then verify that the token request succeeds and the ODS file opens without timing out.