diff --git a/alkatorapi/views.py b/alkatorapi/views.py
index 7544492..6c7bd81 100644
--- a/alkatorapi/views.py
+++ b/alkatorapi/views.py
@@ -9,6 +9,8 @@ def register(request):
         return HttpResponse('{"reason":"Too late!"}', status=400, content_type='application/json')
     if not request.POST.get('agreement'):
         return HttpResponse('{"reason":"Je potřeba souhlasit se zpracováním údajů!"}', status=400, content_type='application/json')
+    if User.objects.filter(email=request.POST['email']):
+        return HttpResponse('{"reason":"Email je již registrován!"}', status=400, content_type='application/json')
     user = User(first_name=request.POST['first_name'], last_name=request.POST['last_name'], email=request.POST['email'])
     user.save()
-    return HttpResponse('{}', content_type='application/json')
+    return HttpResponse('{"reason":"Úspěšná registrace."}', content_type='application/json')