diff -r 2deead259283 -r 7b43de480a11 server/authentication/views.py
--- a/server/authentication/views.py	Thu Apr 23 18:17:10 2015 +0200
+++ b/server/authentication/views.py	Thu Apr 23 18:17:58 2015 +0200
@@ -63,6 +63,7 @@
         serializer = AuthTokenSerializer(data=request.data)
         serializer.is_valid(raise_exception=True)
         user = serializer.validated_data['user']
-        populateVisit(user)
+        if (user.idUser):
+            populateVisit(user)
         token, created = Token.objects.get_or_create(user=user)
         return Response({'token': token.key})
\ No newline at end of file