Fix crash

tournaments/models/tournament.py

@@ -1416,11 +1416,14 @@ class Tournament(BaseModel):
         else:
             return True
 
-    def  umpire_contact(self):
+    def umpire_contact(self):
         if self.umpire_custom_contact is not None:
             print(self.umpire_custom_contact)
             return self.umpire_custom_contact
-        return self.event.creator.full_name()
+        if self.event and self.event.creator:
+            return self.event.creator.full_name()
+        else:
+            return None
 
     def umpire_mail(self):
         if self.umpire_custom_mail is not None:

tournaments/services/email_service.py

@@ -334,7 +334,8 @@ class TournamentEmailService:
     def _format_umpire_contact(tournament):
         contact_parts = []
         creator_full_name = tournament.umpire_contact()
-        contact_parts.append(creator_full_name)
+        if creator_full_name:
+            contact_parts.append(creator_full_name)
 
         if not tournament.hide_umpire_mail:
             creator_email = tournament.umpire_mail()