diff --git a/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_dvr_neutron_agent.py b/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_dvr_neutron_agent.py
index a4158ff10a9..8cb65f6527b 100644
--- a/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_dvr_neutron_agent.py
+++ b/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_dvr_neutron_agent.py
@@ -377,8 +377,9 @@ class OVSDVRNeutronAgent(object):
             subnet_info = self.plugin_rpc.get_subnet_for_dvr(
                 self.context, subnet_uuid, fixed_ips=fixed_ips)
             if not subnet_info:
-                LOG.error(_LE("DVR: Unable to retrieve subnet information "
-                              "for subnet_id %s"), subnet_uuid)
+                LOG.warning(_LW("DVR: Unable to retrieve subnet information "
+                                "for subnet_id %s. The subnet or the gateway "
+                                "may have already been deleted"), subnet_uuid)
                 return
             LOG.debug("get_subnet_for_dvr for subnet %(uuid)s "
                       "returned with %(info)s",
@@ -528,6 +529,14 @@ class OVSDVRNeutronAgent(object):
             # for this subnet
             subnet_info = self.plugin_rpc.get_subnet_for_dvr(
                 self.context, subnet_uuid, fixed_ips=fixed_ips)
+            if not subnet_info:
+                LOG.warning(_LW("DVR: Unable to retrieve subnet information "
+                                "for subnet_id %s. The subnet or the gateway "
+                                "may have already been deleted"), subnet_uuid)
+                return
+            LOG.debug("get_subnet_for_dvr for subnet %(uuid)s "
+                      "returned with %(info)s",
+                      {"uuid": subnet_uuid, "info": subnet_info})
             ldm = LocalDVRSubnetMapping(subnet_info, port.ofport)
             self.local_dvr_map[subnet_uuid] = ldm
         else:
diff --git a/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py b/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
index f9aec4e685d..0869aba36fc 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
@@ -2350,6 +2350,26 @@ class TestOvsDvrNeutronAgent(object):
             ]
             self.assertEqual(expected_on_tun_br, tun_br.mock_calls)
 
+    def test_port_bound_for_dvr_with_csnat_ports_without_subnet(self):
+        self._setup_for_dvr_test()
+        int_br = mock.create_autospec(self.agent.int_br)
+        tun_br = mock.create_autospec(self.agent.tun_br)
+
+        # get_subnet_for_dvr RPC returns {} on error
+        with mock.patch.object(self.agent.dvr_agent.plugin_rpc,
+                               'get_subnet_for_dvr',
+                               return_value={}),\
+                mock.patch.object(self.agent, 'int_br', new=int_br),\
+                mock.patch.object(self.agent, 'tun_br', new=tun_br),\
+                mock.patch.object(self.agent.dvr_agent, 'int_br', new=int_br),\
+                mock.patch.object(self.agent.dvr_agent, 'tun_br', new=tun_br):
+            self.agent.port_bound(
+                self._port, self._net_uuid, 'vxlan',
+                None, None, self._fixed_ips,
+                n_const.DEVICE_OWNER_ROUTER_SNAT,
+                False)
+            self.assertFalse(int_br.install_dvr_to_src_mac.called)
+
     def test_treat_devices_removed_for_dvr_interface(self):
         self._test_treat_devices_removed_for_dvr_interface()
         self._test_treat_devices_removed_for_dvr_interface(ip_version=6)