Fix extra token accesses when someone is already logged

tfjm/middlewares.py

@@ -79,6 +79,7 @@ class ExtraAccessMiddleware(object):
             if request.user.is_authenticated:
                 pool = Pool.objects.filter(extra_access_token=request.GET["extra_access_token"])
                 if pool.exists():
+                    pool = pool.get()
                     pool.juries.add(request.user)
                     pool.save()
         else: