diff --git a/ironic/api/controllers/v1/ramdisk.py b/ironic/api/controllers/v1/ramdisk.py
index 967d6e3ea0..8ae9e1f1e2 100644
--- a/ironic/api/controllers/v1/ramdisk.py
+++ b/ironic/api/controllers/v1/ramdisk.py
@@ -292,8 +292,8 @@ DATA_VALIDATOR = args.schema({
         'inventory': {
             'type': 'object',
             'properties': {
-                'bmc_address': {'type': 'string'},
-                'bmc_v6address': {'type': 'string'},
+                'bmc_address': {'type': ['string', 'null']},
+                'bmc_v6address': {'type': ['string', 'null']},
                 'interfaces': {
                     'type': 'array',
                     'items': {
diff --git a/ironic/tests/unit/api/controllers/v1/test_ramdisk.py b/ironic/tests/unit/api/controllers/v1/test_ramdisk.py
index 303cd18221..5b19f43151 100644
--- a/ironic/tests/unit/api/controllers/v1/test_ramdisk.py
+++ b/ironic/tests/unit/api/controllers/v1/test_ramdisk.py
@@ -502,6 +502,19 @@ class TestContinueInspection(test_api_base.BaseApiTest):
             mock.ANY, mock.ANY, self.node.uuid, inventory=self.inventory,
             plugin_data={'test': 42}, topic='test-topic')
 
+    def test_bmc_address_as_none(self, mock_lookup, mock_continue):
+        mock_lookup.return_value = self.node
+        self.inventory['bmc_address'] = None
+        self.inventory['bmc_v6address'] = None
+        response = self.post_json('/continue_inspection', self.data)
+        self.assertEqual(http_client.ACCEPTED, response.status_int)
+        self.assertEqual({'uuid': self.node.uuid}, response.json)
+        mock_lookup.assert_called_once_with(
+            mock.ANY, self.addresses, [], node_uuid=None)
+        mock_continue.assert_called_once_with(
+            mock.ANY, mock.ANY, self.node.uuid, inventory=self.inventory,
+            plugin_data={'test': 42}, topic='test-topic')
+
     @mock.patch.object(rpcapi.ConductorAPI, 'get_node_with_token',
                        autospec=True)
     def test_new_api(self, mock_get_node, mock_lookup, mock_continue):
diff --git a/releasenotes/notes/bmc-address-none-8214a3f7b67d6a0d.yaml b/releasenotes/notes/bmc-address-none-8214a3f7b67d6a0d.yaml
new file mode 100644
index 0000000000..129d74b5a7
--- /dev/null
+++ b/releasenotes/notes/bmc-address-none-8214a3f7b67d6a0d.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixes inspection failure when ``bmc_address`` or ``bmc_v6address`` is
+    ``null`` in the inventory received from the ramdisk.