diff --git a/tests/unit/test_actions.py b/tests/unit/test_actions.py
index ffb83dc..611ff5e 100644
--- a/tests/unit/test_actions.py
+++ b/tests/unit/test_actions.py
@@ -141,3 +141,11 @@ class TestActionView(TestActions):
         self.assertEqual(action.target.id, "photo2")
         self.assertEqual(action.target_type, "photo")
 
+class TestActionMisc(TestActions):
+    def test_update_fields_with_no_target(self):
+        """Check that an action object can be updated with no target"""
+        action = self.test_actions[0]
+        action.target = None
+        action.target_type = None
+        # Check that no exception is raised
+        action._update_fields_with_objects()
diff --git a/tests/unit/test_activities.py b/tests/unit/test_activities.py
index d77f460..df0a7ba 100644
--- a/tests/unit/test_activities.py
+++ b/tests/unit/test_activities.py
@@ -131,3 +131,12 @@ class TestActivityView(TestActivities):
                                 {"data": "", "type": "invalid"}))
         with self.assertRaises(NotImplementedError):
             self.client.activity.view(self.test_activities[0])
+
+class TestActivityMisc(TestActivities):
+    def test_update_fields_with_no_type(self):
+        """Check that an activity object can be updated with no type"""
+        activity = self.test_activities[0]
+        activity.type = None
+        activity.data = None
+        # Check that no exception is raised
+        activity._update_fields_with_objects()
diff --git a/tests/unit/test_albums.py b/tests/unit/test_albums.py
index 811c39f..6bdb0b7 100644
--- a/tests/unit/test_albums.py
+++ b/tests/unit/test_albums.py
@@ -355,3 +355,12 @@ class TestAlbumView(TestAlbums):
         self.assertEqual(album.cover.id, "2b")
         self.assertEqual(album.cover.tags, ["tag3", "tag4"])
         self.assertEqual(album.photos[0].id, self.test_photos[1].id)
+
+class TestAlbumMisc(TestAlbums):
+    def test_update_fields_with_no_cover(self):
+        """Check that an album object can be updated with no cover"""
+        album = self.test_albums[0]
+        album.cover = None
+        album.photos = None
+        # Check that no exception is raised
+        album._update_fields_with_objects()