Undefined array key in Push.php often in log

[ArminXG]

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Steps to reproduce

1. Use Talk together with notifications/notify_push
2. When in Talk conversation, sometimes a bunch of error messages in nextcloud.log appear

Actual behaviour

nextcloud.log often shows messages like:

"reqId":"Fps7d1sA6pJ5sRwqB","level":2,"time":"2026-09-03T10:45:36+00:00","remoteAddr":"172.16.20.20","user":"testuser","app":"PHP","method":"GET","url":"/ocs/v2.php/apps/spreed/api/v1/chat/hmhvbiof/10124/context?limit=50","scriptName":"/ocs/v2.php","message":"Undefined array key -55 at /var/www/nextcloud/apps/notifications/lib/Push.php#298","userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36","version":"34.0.3.2","data":{"app":"PHP"}}

Server configuration

Web server: Apache

Database: MariaDB

PHP version: 8.4

Nextcloud version: 34.0.3

Browser

Browser name: Chromium

Operating system: Debian

[nickvergessen]

Already fixed in #3317