diff --git a/apps/authentication/models.py b/apps/authentication/models.py
index 6e7c2b8d9..cb4ded701 100644
--- a/apps/authentication/models.py
+++ b/apps/authentication/models.py
@@ -68,8 +68,9 @@ def is_member(self):
         """
         Returns true if the User object is associated with Online.
         """
-        if AllowedUsername.objects.filter(username=self.ntnu_username.lower()).filter(expiration_date__gte=timezone.now()).count() > 0:
-            return True
+        if self.ntnu_username:
+            if AllowedUsername.objects.filter(username=self.ntnu_username.lower()).filter(expiration_date__gte=timezone.now()).count() > 0:
+                return True
         return False
 
     def get_full_name(self):