Activity App doesnt show Activitys in Shares

Nextcloud version (eg, 10.0.2): 11.0.2
Operating system and version (eg, Ubuntu 16.04): 14.04 TLS
Apache or nginx version (eg, Apache 2.4.25): 2.4.7
PHP version (eg, 5.6): 7.0.14

Hallo,

The activity app dont show activitys from other users.
I have one admin user that shrae one folder for every user.

For recognizing changes in the shares, the activitys are very important to me.

The Pictury shows what i only get.

No errors in Log!

For me it also not working, but i got some errors in the logs.
So the email notification is also not working.
I updated from owncloud to nextcloud over the following path:

ownCloud 7.0.4 to 7.0.15
7.0.15 to 8.0.16
8.0.16 to 8.1.12
8.1.12 to 8.2.10
8.2.10 to NextCloud 9.0.56
9.0.56 to 10.0.3
10.0.3 to 11.0.1
11.0.1 to 11.0.2
11.0.2 to 11.0.3

And using right now: Nextclound version 11.0.3.2

PHP
Version: 7.0.15
Memory Limit: 128.0 MB
Max Execution Time: 3600
Upload max size: 16.0 GB

Database
Type: mysql
Version: 5.7.17
Size: 139.7 MB

But i found something in the logging area:

Level------App
Error------Index

TypeError: Argument 2 passed to OC\Activity\Event::setSubject() must be of the type array, null given, called in /var/www/nextcloud-11.0.3/apps/activity/lib/GroupHelper.php on line 151

/var/www/nextcloud-11.0.3/apps/activity/lib/GroupHelper.php - line 151: OC\Activity\Event->setSubject(‘created_self’, NULL)

/var/www/nextcloud-11.0.3/apps/activity/lib/GroupHelper.php - line 89: OCA\Activity\GroupHelper->arrayToEvent(Array)

/var/www/nextcloud-11.0.3/apps/activity/lib/Data.php - line 265: OCA\Activity\GroupHelper->addActivity(Array)

/var/www/nextcloud-11.0.3/apps/activity/lib/Controller/OCSEndPoint.php - line 211: OCA\Activity\Data->get(Object(OCA\Activity\GroupHelper), Object(OCA\Activity\UserSettings), ‘admin’, 0, 50, ‘desc’, ‘all’, ‘’, 0)

/var/www/nextcloud-11.0.3/apps/activity/lib/Controller/OCSEndPoint.php - line 183: OCA\Activity\Controller\OCSEndPoint->get(Array)

/var/www/nextcloud-11.0.3/apps/activity/lib/Controller/EndPoint.php - line 70: OCA\Activity\Controller\OCSEndPoint->getFilter(Array)
[internal function] OCA\Activity\Controller\EndPoint->getFilter(‘all’)

/var/www/nextcloud-11.0.3/lib/private/AppFramework/Http/Dispatcher.php - line 160: call_user_func_array(Array, Array)

/var/www/nextcloud-11.0.3/lib/private/AppFramework/Http/Dispatcher.php - line 90: OC\AppFramework\Http\Dispatcher->executeController(Object(OCA\Activity\Controller\EndPoint), ‘getFilter’)

/var/www/nextcloud-11.0.3/lib/private/AppFramework/App.php - line 114: OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Activity\Controller\EndPoint), ‘getFilter’)

/var/www/nextcloud-11.0.3/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47: OC\AppFramework\App main(‘EndPointControl…’, ‘getFilter’, Object(OC\AppFramework\DependencyInjection\DIContainer), Array)

[internal function] OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)

/var/www/nextcloud-11.0.3/lib/private/Route/Router.php - line 299: call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)

/var/www/nextcloud-11.0.3/lib/base.php - line 1010: OC\Route\Router->match(’/apps/activity/…’)

/var/www/nextcloud-11.0.3/index.php - line 40: OC handleRequest()

{main}

Next one appears after opening the activity stream:

Level------App
Error------Index

TypeError: Argument 2 passed to OC\Activity\Event::setSubject() must be of the type array, null given, called in /var/www/nextcloud-11.0.3/apps/activity/lib/GroupHelper.php on line 151

/var/www/nextcloud-11.0.3/apps/activity/lib/GroupHelper.php - line 151: OC\Activity\Event->setSubject(‘created_self’, NULL)

/var/www/nextcloud-11.0.3/apps/activity/lib/GroupHelper.php - line 89: OCA\Activity\GroupHelper->arrayToEvent(Array)

/var/www/nextcloud-11.0.3/apps/activity/lib/Data.php - line 265: OCA\Activity\GroupHelper->addActivity(Array)

/var/www/nextcloud-11.0.3/apps/activity/lib/Controller/OCSEndPoint.php - line 211: OCA\Activity\Data->get(Object(OCA\Activity\GroupHelper), Object(OCA\Activity\UserSettings), ‘admin’, 0, 45, ‘desc’, ‘all’, ‘’, 0)

/var/www/nextcloud-11.0.3/apps/activity/lib/Controller/OCSEndPoint.php - line 183: OCA\Activity\Controller\OCSEndPoint->get(Array)

/var/www/nextcloud-11.0.3/apps/activity/lib/Controller/EndPoint.php - line 70: OCA\Activity\Controller\OCSEndPoint->getFilter(Array)

[internal function] OCA\Activity\Controller\EndPoint->getFilter(‘all’)

/var/www/nextcloud-11.0.3/lib/private/AppFramework/Http/Dispatcher.php - line 160: call_user_func_array(Array, Array)

/var/www/nextcloud-11.0.3/lib/private/AppFramework/Http/Dispatcher.php - line 90: OC\AppFramework\Http\Dispatcher->executeController(Object(OCA\Activity\Controller\EndPoint), ‘getFilter’)

/var/www/nextcloud-11.0.3/lib/private/AppFramework/App.php - line 114: OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Activity\Controller\EndPoint), ‘getFilter’)

/var/www/nextcloud-11.0.3/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47: OC\AppFramework\App main(‘EndPointControl…’, ‘getFilter’, Object(OC\AppFramework\DependencyInjection\DIContainer), Array)

[internal function] OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)

/var/www/nextcloud-11.0.3/lib/private/Route/Router.php - line 299: call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)

/var/www/nextcloud-11.0.3/lib/base.php - line 1010: OC\Route\Router->match(’/apps/activity/…’)

/var/www/nextcloud-11.0.3/index.php - line 40: OC handleRequest()

{main}

thanks in advance

Update:
I found out, that this only happens to old users who are migrated from the older versions of ownloud.
With new users who are created on the new nextcloud platform, this do not happen.
Maybe it can be helpful to track this.

There was a new report and a developer started to have a look into it. Closing discussion here:
Activity app no longer shows information