diff --git a/README.md b/README.md
index f69f17c..85bf0c6 100644
--- a/README.md
+++ b/README.md
@@ -446,6 +446,7 @@ If you have a problem or suggestion, please [open an issue](https://github.com/o
 ## Related Projects and Resources
 
 - **GitHub Action:** [octoDNS-Sync](https://github.com/marketplace/actions/octodns-sync)
+- **NixOS Integration:** [NixOS-DNS](https://github.com/Janik-Haag/nixos-dns/)
 - **Sample Implementations.** See how others are using it
   - [`hackclub/dns`](https://github.com/hackclub/dns)
   - [`kubernetes/k8s.io:/dns`](https://github.com/kubernetes/k8s.io/tree/main/dns)
diff --git a/octodns/manager.py b/octodns/manager.py
index 54e8c28..7529a45 100644
--- a/octodns/manager.py
+++ b/octodns/manager.py
@@ -620,7 +620,12 @@ class Manager(object):
         aliased_zones = {}
         delayed_arpa = []
         futures = []
+
         for zone_name, config in zones.items():
+            if config is None:
+                raise ManagerException(
+                    f'Requested zone "{zone_name}" not found in config'
+                )
             decoded_zone_name = idna_decode(zone_name)
             self.log.info('sync:   zone=%s', decoded_zone_name)
             if 'alias' in config:
diff --git a/tests/test_octodns_manager.py b/tests/test_octodns_manager.py
index 0e4a15e..a369b1b 100644
--- a/tests/test_octodns_manager.py
+++ b/tests/test_octodns_manager.py
@@ -79,6 +79,13 @@ class TestManager(TestCase):
             )
         self.assertTrue('missing sources' in str(ctx.exception))
 
+    def test_missing_zone(self):
+        with self.assertRaises(ManagerException) as ctx:
+            Manager(get_config_filename('dynamic-config.yaml')).sync(
+                ['missing.zones.']
+            )
+        self.assertTrue('Requested zone ' in str(ctx.exception))
+
     def test_missing_targets(self):
         with self.assertRaises(ManagerException) as ctx:
             Manager(get_config_filename('provider-problems.yaml')).sync(