diff --git a/pyschlage/lock.py b/pyschlage/lock.py
index 499d88d..16e9c44 100644
--- a/pyschlage/lock.py
+++ b/pyschlage/lock.py
@@ -138,7 +138,7 @@ def from_json(cls, auth: Auth, json: dict) -> Lock:
             _auth=auth,
             device_id=json["deviceId"],
             name=json["name"],
-            model_name=json["modelName"],
+            model_name=json.get("modelName", ""),
             device_type=json["devicetypeId"],
             connected=json.get("connected", False),
             battery_level=attributes.get("batteryLevel"),
diff --git a/tests/test_lock.py b/tests/test_lock.py
index 30800c2..181f213 100644
--- a/tests/test_lock.py
+++ b/tests/test_lock.py
@@ -58,6 +58,13 @@ def test_from_json_wifi_lock_unavailable(
         assert lock.is_locked is None
         assert lock.is_jammed is None
 
+    def test_from_json_no_model_name(
+        self, mock_auth: mock.Mock, lock_json: dict[Any, Any]
+    ) -> None:
+        lock_json.pop("modelName", None)
+        lock = Lock.from_json(mock_auth, lock_json)
+        assert lock.model_name == ""
+
     def test_diagnostics(self, mock_auth: mock.Mock, lock_json: dict) -> None:
         lock = Lock.from_json(mock_auth, lock_json)
         want = {