Error when deploying to App Store

[ghost]

Hi there,

when deploying to Apple's TestFlight and the App Store I get the (actually predictable) error that is the same error as when compiling locally in development mode. The first time the App is started the scss is not built and the whole screen design collapses.

Since it is an error that will reappear every time the app is updated it is an unpleasant unser experience.
How could this be fixed?
Is there any workaround for this problem?

Regards