No Calendar Export possible 11.0.0

I have a problem to export two of my four calendars. Export via Webinterface and URL (/?EXPORT) creates this error:
FATAL WEBDAV

Sabre\VObject\InvalidDataException: Unsupported VALUE parameter for DTEND property. You supplied “”
/var/www/nextcloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 453: Sabre\VObject\Document->createProperty(‘DTEND’, NULL, Array)
/var/www/nextcloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 234: Sabre\VObject\Parser\MimeDir->readProperty(‘DTEND;TZID=Euro…’)
/var/www/nextcloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 217: Sabre\VObject\Parser\MimeDir->parseLine(‘DTEND;TZID=Euro…’)
/var/www/nextcloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 181: Sabre\VObject\Parser\MimeDir->parseLine(‘DTEND;TZID=Euro…’)
/var/www/nextcloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 89: Sabre\VObject\Parser\MimeDir->parseDocument()
/var/www/nextcloud/3rdparty/sabre/vobject/lib/Reader.php - line 46: Sabre\VObject\Parser\MimeDir->parse(‘BEGIN VCALENDAR…’, 0)
/var/www/nextcloud/3rdparty/sabre/dav/lib/CalDAV/ICSExportPlugin.php - line 307: Sabre\VObject\Reader read(‘BEGIN VCALENDAR…’)
/var/www/nextcloud/3rdparty/sabre/dav/lib/CalDAV/ICSExportPlugin.php - line 222: Sabre\CalDAV\ICSExportPlugin->mergeObjects(Array, Array)
/var/www/nextcloud/3rdparty/sabre/dav/lib/CalDAV/ICSExportPlugin.php - line 151: Sabre\CalDAV\ICSExportPlugin->generateResponse(‘calendars/klaus…’, NULL, NULL, false, false, ‘text/calendar’, Array, Object(Sabre\HTTP\Response))
[internal function] Sabre\CalDAV\ICSExportPlugin->httpGet(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/nextcloud/3rdparty/sabre/event/lib/EventEmitterTrait.php - line 105: call_user_func_array(Array, Array)
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 479: Sabre\Event\EventEmitter->emit(‘method GET’, Array)
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/nextcloud/apps/dav/lib/Server.php - line 227: Sabre\DAV\Server->exec()
/var/www/nextcloud/apps/dav/appinfo/v2/remote.php - line 30: OCA\DAV\Server->exec()
/var/www/nextcloud/remote.php - line 165: require_once(’/var/www/nextcl…’)
{main}

I think there are wrong entries in this calendar. Is there a way to check them on database level?
with the other calendars the export work as expected.

I got the same Problem with 11.0.1! Only at one user.
Is there a possibility to fix this, or a DB query that deletes broken calendar entries?

Please report a bug in https://github.com/nextcloud/server
Thx! :slight_smile:

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