We are getting database errors on our frontend (host status) since upgrading to 3.0 last week. So far, I haven't found this bug interupting normal operations, however, it's annoying to say the least. I didn't find a sollution online, though I saw some mentions that look a little like out problem.

It is on the dash every now and then. Sometimes it just goes away,

–Undefined variable: hosts_with_unack_triggers [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() in app/views/monitoring.widget.hosts.view.php:190]
–array_key_exists() expects parameter 2 to be array, null given [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() ? array_key_exists() in app/views/monitoring.widget.hosts.view.php:190]
–Undefined variable: hosts_with_unack_triggers [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() in app/views/monitoring.widget.hosts.view.php:190]
–array_key_exists() expects parameter 2 to be array, null given [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() ? array_key_exists() in app/views/monitoring.widget.hosts.view.php:190]
–Undefined variable: hosts_with_unack_triggers [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() in app/views/monitoring.widget.hosts.view.php:190]
–array_key_exists() expects parameter 2 to be array, null given [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() ? array_key_exists() in app/views/monitoring.widget.hosts.view.php:190]
–Undefined variable: hosts_with_unack_triggers [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() in app/views/monitoring.widget.hosts.view.php:190]
–array_key_exists() expects parameter 2 to be array, null given [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() ? array_key_exists() in app/views/monitoring.widget.hosts.view.php:190]
–Undefined variable: hosts_with_unack_triggers [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() in app/views/monitoring.widget.hosts.view.php:190]
–array_key_exists() expects parameter 2 to be array, null given [zabbix.php:21 ? require_once() ? ZBase->run() ? ZBase->processRequest() ? CView->getOutput() ? include() ? array_key_exists() in app/views/monitoring.widget.hosts.view.php:190]