diff --git a/octodns/provider/ns1.py b/octodns/provider/ns1.py
index bf08358..510b099 100644
--- a/octodns/provider/ns1.py
+++ b/octodns/provider/ns1.py
@@ -849,6 +849,8 @@ class Ns1Provider(BaseProvider):
 
             for monitor in self._client.monitors.values():
                 data = self._parse_notes(monitor['notes'])
+                if not data:
+                    continue
                 if expected_host == data['host'] and \
                    expected_type == data['type']:
                     # This monitor does not belong to this record
diff --git a/tests/test_octodns_provider_ns1.py b/tests/test_octodns_provider_ns1.py
index df517a2..e21fe0d 100644
--- a/tests/test_octodns_provider_ns1.py
+++ b/tests/test_octodns_provider_ns1.py
@@ -659,6 +659,18 @@ class TestNs1ProviderDynamic(TestCase):
             },
             'four': monitor_four,
             'five': monitor_five,
+            'six': {
+                'config': {
+                    'host': '10.10.10.10',
+                },
+                'notes': 'non-conforming notes',
+            },
+            'seven': {
+                'config': {
+                    'host': '11.11.11.11',
+                },
+                'notes': None,
+            },
         }
 
         # Would match, but won't get there b/c it's not dynamic