NC 28.0.4: TypeError key(): Argument #1 ($array) must be of type array, string given Error while running background job

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Nextcloud version: 28.0.4
Operating system and version: Debian 11.9
Apache or nginx version:
PHP version: 8.2.17

The issue you are facing:
I found the error in the Logs of my Nextcloud. The first time I saw it was after the Update to 28.0.4. It seems like everything is working (including the Cron), its just this Output in the Log every 5 minutes (= after every time the cron runs)

Is this the first time you’ve seen this error? (Y/N): Yes

Steps to replicate it:

  1. Run the Nextcloud cron.php

The output of your Nextcloud log in Admin > Logging:

TypeError key(): Argument #1 ($array) must be of type array, string given Error while running background job (class: OCA\Polls\Cron\AutoReminderCron, arguments: )

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

$CONFIG = array (
  'passwordsalt' => '***',
  'secret' => '***',
  'trusted_domains' => 
  array (
  'datadirectory' => '/var/www/nextcloud/data/a0269387ec24',
  'dbtype' => 'mysql',
  'version' => '',
  'overwrite.cli.url' => 'https://***',
  'dbname' => '***',
  'dbhost' => '***',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => '***',
  'dbpassword' => '***',
  'installed' => true,
  'instanceid' => '***',
  'trashbin_retention_obligation' => 'auto, 90',
  'versions_retention_obligation' => 'auto, 90',
  'activity_expire_days' => 90,
  'default_phone_region' => 'DE',
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_from_address' => 'cloud',
  'mail_domain' => '***',
  'mail_smtpauth' => 1,
  'mail_smtphost' => '***',
  'mail_smtpname' => '***',
  'mail_smtppassword' => '***',
  'mail_smtpport' => '465',
  'maintenance' => false,
  'theme' => '',
  'log_type' => 'file',
  'logtimezone' => 'Europe/Berlin',
  'logfile' => '/var/www/nextcloud/logs/nextcloud.log',
  'loglevel' => 2,
  'syslog_tag' => 'Nextcloud',

Output errors in nextcloud.log: (every 5 mins)

{"reqId":"cNu2AeWATpb4ilutMg7H","level":3,"time":"2024-04-11T11:25:01+02:00","remoteAddr":"","user":"--","app":"core","method":"","url":"--","message":"Error while running background job (class: OCA\\Polls\\Cron\\AutoReminderCron, arguments: )","userAgent":"--","version":"","exception":{"Exception":"TypeError","Message":"key(): Argument #1 ($array) must be of type array, string given","Code":0,"Trace":[{"file":"/var/www/nextcloud/httpdocs/apps/polls/lib/Model/Group/Group.php","line":64,"function":"key"},{"file":"/var/www/nextcloud/httpdocs/apps/polls/lib/Service/MailService.php","line":277,"function":"getMembers","class":"OCA\\Polls\\Model\\Group\\Group","type":"->"},{"file":"/var/www/nextcloud/httpdocs/apps/polls/lib/Service/MailService.php","line":265,"function":"sendAutoReminderToRecipients","class":"OCA\\Polls\\Service\\MailService","type":"->"},{"file":"/var/www/nextcloud/httpdocs/apps/polls/lib/Service/MailService.php","line":228,"function":"processSharesForAutoReminder","class":"OCA\\Polls\\Service\\MailService","type":"->"},{"file":"/var/www/nextcloud/httpdocs/apps/polls/lib/Cron/AutoReminderCron.php","line":49,"function":"sendAutoReminder","class":"OCA\\Polls\\Service\\MailService","type":"->"},{"file":"/var/www/nextcloud/httpdocs/lib/public/BackgroundJob/Job.php","line":81,"function":"run","class":"OCA\\Polls\\Cron\\AutoReminderCron","type":"->"},{"file":"/var/www/nextcloud/httpdocs/lib/public/BackgroundJob/TimedJob.php","line":102,"function":"start","class":"OCP\\BackgroundJob\\Job","type":"->"},{"file":"/var/www/nextcloud/httpdocs/lib/public/BackgroundJob/TimedJob.php","line":92,"function":"start","class":"OCP\\BackgroundJob\\TimedJob","type":"->"},{"file":"/var/www/nextcloud/httpdocs/cron.php","line":152,"function":"execute","class":"OCP\\BackgroundJob\\TimedJob","type":"->"}],"File":"/var/www/nextcloud/httpdocs/apps/polls/lib/Model/Group/Group.php","Line":64,"message":"Error while running background job (class: OCA\\Polls\\Cron\\AutoReminderCron, arguments: )","exception":{},"CustomMessage":"Error while running background job (class: OCA\\Polls\\Cron\\AutoReminderCron, arguments: )"}}

Does anyone know a solution to it?

The issue seems to be caused by the Polls app. Here you will find more detailed information about the issue:


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