diff --git a/djangoldp_notification/models.py b/djangoldp_notification/models.py
index ba1ca87..fe31855 100644
--- a/djangoldp_notification/models.py
+++ b/djangoldp_notification/models.py
@@ -10,6 +10,7 @@ from django.db import models
 from django.db.models.signals import post_save
 from django.dispatch import receiver
 from oidc_provider.models import Token
+from django.core.urlresolvers import NoReverseMatch
 
 from djangoldp.fields import LDPUrlField
 from djangoldp.models import Model
@@ -54,10 +55,14 @@ class Subscription(Model):
 # --- SUBSCRIPTION SYSTEM ---
 @receiver(post_save, dispatch_uid="callback_notif")
 def send_notification(sender, instance, **kwargs):
-    if sender != Notification and issubclass(sender, Model):
+    if sender != Notification:
         threads = []
-        urlContainer = settings.BASE_URL + Model.container_id(instance)
-        urlResource = settings.BASE_URL + Model.resource_id(instance)
+        try:
+            urlContainer = settings.BASE_URL + Model.container_id(instance)
+            urlResource = settings.BASE_URL + Model.resource_id(instance)
+        except NoReverseMatch:
+            return
+
         for subscription in Subscription.objects.filter(models.Q(object=urlResource)|models.Q(object=urlContainer)):
             process = Thread(target=send_request, args=[subscription.inbox, urlResource])
             process.start()