diff --git a/gregui/api/views/invitation.py b/gregui/api/views/invitation.py
index 1eca446e5a7694f7118c63ba33328b84240b4e87..98a0bd8e1839fa49675a4d3598b37b3d8b680a71 100644
--- a/gregui/api/views/invitation.py
+++ b/gregui/api/views/invitation.py
@@ -142,8 +142,12 @@ class InvitedGuestView(GenericAPIView):
             else SessionType.FEIDE.value
         )
 
-        fnr = self._get_identity_or_none(person, Identity.IdentityType.NORWEGIAN_NATIONAL_ID_NUMBER)
-        passport = self._get_identity_or_none(person, Identity.IdentityType.PASSPORT_NUMBER)
+        fnr = self._get_identity_or_none(
+            person, Identity.IdentityType.NORWEGIAN_NATIONAL_ID_NUMBER
+        )
+        passport = self._get_identity_or_none(
+            person, Identity.IdentityType.PASSPORT_NUMBER
+        )
         feide_id = self._get_identity_or_none(person, Identity.IdentityType.FEIDE_ID)
 
         data = {
@@ -154,7 +158,7 @@ class InvitedGuestView(GenericAPIView):
                 "mobile_phone": person.private_mobile and person.private_mobile.value,
                 "fnr": fnr,
                 "passport": passport,
-                "feide_id": feide_id
+                "feide_id": feide_id,
             },
             "sponsor": {
                 "first_name": sponsor.first_name,
@@ -241,10 +245,10 @@ class InvitedGuestView(GenericAPIView):
         return number_of_fields_filled_in == len(person_data.keys())
 
     @staticmethod
-    def _get_identity_or_none(person: Person, identity_type: Identity.IdentityType) -> Optional[str]:
+    def _get_identity_or_none(
+        person: Person, identity_type: Identity.IdentityType
+    ) -> Optional[str]:
         try:
-            return person.identities.get(
-                type=identity_type
-            ).value
+            return person.identities.get(type=identity_type).value
         except Identity.DoesNotExist:
             return None