fix error

rowers/views/racesviews.py

@@ -1901,6 +1901,7 @@ def virtualevent_addboat_view(request, id=0):
 
                 registeredname = r.user.first_name+' '+r.user.last_name
                 email = follower.emailaddress
+                try:
                     if follower.user.id not in registereduserids:
                         _ = myqueue(
                             queue,
@@ -1908,6 +1909,9 @@ def virtualevent_addboat_view(request, id=0):
                             email, othername,
                             registeredname, race.name, race.id,
                             )
+                        registereduserids.append(follower.user.id)
+                except AttributeError:
+                    pass
 
             url = reverse('virtualevent_view',
                           kwargs={