diff --git a/server/src/com/cloud/network/NetworkManagerImpl.java b/server/src/com/cloud/network/NetworkManagerImpl.java
index 7adcf07f044..4a8b38fbc7c 100755
--- a/server/src/com/cloud/network/NetworkManagerImpl.java
+++ b/server/src/com/cloud/network/NetworkManagerImpl.java
@@ -2886,7 +2886,7 @@ public class NetworkManagerImpl extends ManagerBase implements NetworkManager, L
             }
 
             // Save usage event
-            if (ip.getAllocatedToAccountId() != Account.ACCOUNT_ID_SYSTEM) {
+            if (ip.getAllocatedToAccountId() != null && ip.getAllocatedToAccountId() != Account.ACCOUNT_ID_SYSTEM) {
                 VlanVO vlan = _vlanDao.findById(ip.getVlanId());
 
                 String guestType = vlan.getVlanType().toString();