diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandler.java b/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandler.java
index 3cc12b3..3be244e 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandler.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandler.java
@@ -628,7 +628,9 @@
         public void event(MastershipEvent event) {
             sendAllInstances("updateInstance");
             Device device = deviceService.getDevice(event.subject());
-            sendMessage(deviceMessage(new DeviceEvent(DEVICE_UPDATED, device)));
+            if (device != null) {
+                sendMessage(deviceMessage(new DeviceEvent(DEVICE_UPDATED, device)));
+            }
         }
     }