Fix join view when not logged in but URL correct

temba/orgs/views/views.py

@@ -1820,7 +1820,7 @@ def pre_process(self, request, *args, **kwargs):
 
             # if user exists and is logged in then they just need to accept
             user = User.get_by_email(self.invitation.email)
-            if user and self.invitation.email.lower() == request.user.email.lower():
+            if user and request.user.is_authenticated and request.user.email.lower() == self.invitation.email.lower():
                 return HttpResponseRedirect(reverse("orgs.org_join_accept", args=[secret]))
 
             logout(request)