diff --git a/pandora/documentcollection/models.py b/pandora/documentcollection/models.py
index a560638d..ff08a971 100644
--- a/pandora/documentcollection/models.py
+++ b/pandora/documentcollection/models.py
@@ -122,7 +122,7 @@ class Collection(models.Model):
         return self.user == user or self.status in ('public', 'featured')
 
     def editable(self, user):
-        if user.is_anonymous():
+        if not user or user.is_anonymous():
             return False
         if self.user == user or \
            self.groups.filter(id__in=user.groups.all()).count() > 0 or \
diff --git a/pandora/itemlist/models.py b/pandora/itemlist/models.py
index 4a35cd8c..ad6f0bcf 100644
--- a/pandora/itemlist/models.py
+++ b/pandora/itemlist/models.py
@@ -115,7 +115,7 @@ class List(models.Model):
         return self.user == user or self.status in ('public', 'featured')
 
     def editable(self, user):
-        if user.is_anonymous():
+        if not user or user.is_anonymous():
             return False
         if self.user == user or \
            self.groups.filter(id__in=user.groups.all()).count() > 0 or \