If you use Siri with Russian language then she will perform your voice shortcut only one time.
Next she always show error: "I'am sorry this app have some problem" (Translation from Russian)
This can be fixed by iPhone restart. And you can start your voice shortcut one more time.
This did not happen when you use English as Siri language.
On English Siri start your voice shortcut without a problem any number of times.
This is not our app bug because Apple Shortcuts App (Workflow App) have the same problem.
You can read users comments by search word "Простите" in https://www.iphones.ru/iNotes/zdes-vse-chto-nuzhno-znat-pro-glavnuyu-fishku-ios-12---komandy-siri-09-17-2018
https://www.iphones.ru/iNotes/vyshlo-prilozhenie-komandy-dlya-siri-kachaem-obyazatelno-09-17-2018
Siri UI Screenshot https://www.dropbox.com/s/dywqr9o9l0k8mxd/Siri_RU_Bug.png?dl=0
Bugreport: 44755632
