Removing a circle breaks the Activity app

[paulvt]

Once you created and deleted a circle (via the Contacts) app, the Activity app cannot be used any more.

Steps to reproduce:

1. Go to the Contacts app
2. Add a circle "Test"
3. Delete this circle
4. Switch to the Activity app

The overview now spams "Could not load activities" messages (very quickly).

This is Circles app version 28.0.0 on Nextcloud 28.0.4.1. Installed via Docker (community) on PHP 8.2/Apache with PostgreSQL as database.

Exception in the logs:

{  "reqId": "SM1NThrV4KlxaekTbvfN",
  "level": 3,
  [...]
  "app": "no app in context",
  "method": "GET",
  "url": "/ocs/v2.php/apps/activity/api/v2/activity/all?format=json&previews=true&since=0",
  "message": "Exception thrown: RuntimeException",
  "userAgent": "[...]",
  "version": "28.0.4.1",
  "exception": {
    "Exception": "RuntimeException",
    "Message": "image not found: image:png webroot: serverroot:/var/www/html",
    "Code": 0,
    "Trace": [
      {
        "file": "/var/www/html/apps/circles/lib/Activity/Provider.php",
        "line": 96,
        "function": "imagePath",
        "class": "OC\\URLGenerator",
        "type": "->",
        "args": [
          "circles",
          "png"
        ]
      },
      {
        "file": "/var/www/html/apps/circles/lib/Activity/Provider.php",
        "line": 67,
        "function": "setIcon",
        "class": "OCA\\Circles\\Activity\\Provider",
        "type": "->",
        "args": [
          [
            "OC\\Activity\\Event"
          ]
        ]
      },
      {
        "file": "/var/www/html/apps/activity/lib/GroupHelper.php",
        "line": 72,
        "function": "parse",
        "class": "OCA\\Circles\\Activity\\Provider",
        "type": "->",
        "args": [
          "en_GB",
          [
            "OC\\Activity\\Event"
          ]
        ]
      },
      {
        "file": "/var/www/html/apps/activity/lib/Data.php",
        "line": 248,
        "function": "addActivity",
        "class": "OCA\\Activity\\GroupHelper",
        "type": "->",
        "args": [
          [
            845,
            1712666130,
            30,
            "circles_as_member",
            "",
            "And 10 more entries, set log level to debug to see all entries"
          ]
        ]
      },
      {
        "file": "/var/www/html/apps/activity/lib/Controller/APIv2Controller.php",
        "line": 205,
        "function": "get",
        "class": "OCA\\Activity\\Data",
        "type": "->",
        "args": [
          [
            "OCA\\Activity\\GroupHelper"
          ],
          [
            "OCA\\Activity\\UserSettings"
          ],
          "paul",
          0,
          50,
          "desc",
          "all",
          "",
          0
        ]
      },
      {
        "file": "/var/www/html/apps/activity/lib/Controller/APIv2Controller.php",
        "line": 152,
        "function": "get",
        "class": "OCA\\Activity\\Controller\\APIv2Controller",
        "type": "->",
        "args": [
          "all",
          0,
          50,
          true,
          "",
          0,
          "desc"
        ]
      },
      {
        "file": "/var/www/html/lib/private/AppFramework/Http/Dispatcher.php",
        "line": 230,
        "function": "getFilter",
        "class": "OCA\\Activity\\Controller\\APIv2Controller",
        "type": "->",
        "args": [
          "all",
          0,
          50,
          true,
          "",
          0,
          "desc"
        ]
      },
      {
        "file": "/var/www/html/lib/private/AppFramework/Http/Dispatcher.php",
        "line": 137,
        "function": "executeController",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->",
        "args": [
          [
            "OCA\\Activity\\Controller\\APIv2Controller"
          ],
          "getFilter"
        ]
      },
      {
        "file": "/var/www/html/lib/private/AppFramework/App.php",
        "line": 184,
        "function": "dispatch",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->",
        "args": [
          [
            "OCA\\Activity\\Controller\\APIv2Controller"
          ],
          "getFilter"
        ]
      },
      {
        "file": "/var/www/html/lib/private/Route/Router.php",
        "line": 315,
        "function": "main",
        "class": "OC\\AppFramework\\App",
        "type": "::",
        "args": [
          "OCA\\Activity\\Controller\\APIv2Controller",
          "getFilter",
          [
            "OC\\AppFramework\\DependencyInjection\\DIContainer"
          ],
          [
            "all",
            "ocs.activity.APIv2.getFilter"
          ]
        ]
      },
      {
        "file": "/var/www/html/ocs/v1.php",
        "line": 65,
        "function": "match",
        "class": "OC\\Route\\Router",
        "type": "->",
        "args": [
          "/ocsapp/apps/activity/api/v2/activity/all"
        ]
      },
      {
        "file": "/var/www/html/ocs/v2.php",
        "line": 23,
        "args": [
          "/var/www/html/ocs/v1.php"
        ],
        "function": "require_once"
      }
    ],
    "File": "/var/www/html/lib/private/URLGenerator.php",
    "Line": 274,
    "CustomMessage": "Exception thrown: RuntimeException"
  }
}