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]