diff --git a/crowdsourcer/tests/test_right_of_reply_views.py b/crowdsourcer/tests/test_right_of_reply_views.py
index c73f4d3..5567492 100644
--- a/crowdsourcer/tests/test_right_of_reply_views.py
+++ b/crowdsourcer/tests/test_right_of_reply_views.py
@@ -157,6 +157,24 @@ def test_council_homepage(self):
         self.assertEqual(first.authority.name, "Aberdeen City Council")
         self.assertEqual(second.authority.name, "Aberdeenshire Council")
 
+    def test_bad_assignments_ignored(self):
+        Assigned.objects.create(
+            marking_session=MarkingSession.objects.get(label="Default"),
+            user=self.user,
+        )
+        url = reverse("authority_ror_authorities")
+        response = self.client.get(url)
+
+        context = response.context
+        assignments = context["assignments"]
+
+        self.assertEqual(len(assignments), 2)
+
+        first = assignments[0]
+        second = assignments[1]
+        self.assertEqual(first.authority.name, "Aberdeen City Council")
+        self.assertEqual(second.authority.name, "Aberdeenshire Council")
+
     def test_council_section_list(self):
         url = reverse("authority_ror_sections", args=("Aberdeenshire Council",))
         response = self.client.get(url)
diff --git a/crowdsourcer/views/rightofreply.py b/crowdsourcer/views/rightofreply.py
index 65ff9c7..7d4ebd5 100644
--- a/crowdsourcer/views/rightofreply.py
+++ b/crowdsourcer/views/rightofreply.py
@@ -50,7 +50,9 @@ def get_queryset(self):
         if user.is_anonymous:
             return None
 
-        qs = Assigned.objects.filter(user=user).order_by("authority__name")
+        qs = Assigned.objects.filter(user=user, authority__isnull=False).order_by(
+            "authority__name"
+        )
 
         return qs