diff --git a/src/config/device-manager/device_manager/db.py b/src/config/device-manager/device_manager/db.py
index c3874701c92..613440232d3 100644
--- a/src/config/device-manager/device_manager/db.py
+++ b/src/config/device-manager/device_manager/db.py
@@ -293,6 +293,7 @@ def evaluate_vn_irb_ip_map(self, vn_set, fwd_mode, ip_used_for, ignore_external=
 
         for vn_subnet in create_set:
             (vn_uuid, subnet_prefix) = vn_subnet.split(':', 1)
+            vn = VirtualNetworkDM.get(vn_uuid)
             subnet_uuid = vn.gateways[subnet_prefix].get('subnet_uuid')
             (sub, length) = subnet_prefix.split('/')
             ip_addr = self.reserve_ip(vn_uuid, subnet_uuid)