Undefined index in item prototype selection popup

1. Go to trigger prototype edit form.
2. Press "Add" to add expression.
3. In popup select "Select prototype".

Once item prototype list is visible, the hidden error occurs.

Undefined index: state [zabbix.php:21 -> require_once() -> ZBase->run() -> ZBase->processRequest() -> CView->getOutput() -> include() -> CConfigFile->{closure}() in app\views\popup.generic.php:430]
Undefined index: state [zabbix.php:21 -> require_once() -> ZBase->run() -> ZBase->processRequest() -> CView->getOutput() -> include() -> CConfigFile->{closure}() in app\views\popup.generic.php:431]