Not having permission to form model opens empty page

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since you said you got an error while loading the activity i guess you will be able to either intrecept the action flow via middleware or listening in a saga to the error action (geta12.com/docs Client: Api - ActivityActions.error) and directly close the issued activity afterwards.

Other possibility would be to add some error boundary in there, see:
geta12.com/docs - Client: Error boundaries

Thank you, that is exactly what I was looking for!