diff --git a/server/src/com/cloud/network/lb/LoadBalancingRulesManagerImpl.java b/server/src/com/cloud/network/lb/LoadBalancingRulesManagerImpl.java
index 67346e14b3b..cdd34357425 100755
--- a/server/src/com/cloud/network/lb/LoadBalancingRulesManagerImpl.java
+++ b/server/src/com/cloud/network/lb/LoadBalancingRulesManagerImpl.java
@@ -1348,8 +1348,9 @@ public class LoadBalancingRulesManagerImpl<Type> extends ManagerBase implements
 
                 if (generateUsageEvent) {
                     // Generate usage event right after all rules were marked for revoke
-                    UsageEventUtils.publishUsageEvent(EventTypes.EVENT_LOAD_BALANCER_DELETE, lb.getAccountId(), 0, lb.getId(), null, LoadBalancingRule.class.getName(),
-                        lb.getUuid());
+                    Network network = _networkModel.getNetwork(lb.getNetworkId());
+                    UsageEventUtils.publishUsageEvent(EventTypes.EVENT_LOAD_BALANCER_DELETE, lb.getAccountId(), network.getDataCenterId(), lb.getId(),
+                            null, LoadBalancingRule.class.getName(), lb.getUuid());
                 }
 
                 return backupMaps;
@@ -1970,6 +1971,11 @@ public class LoadBalancingRulesManagerImpl<Type> extends ManagerBase implements
         List<String> serviceStates = new ArrayList<String>();
         List<LoadBalancerVMMapVO> vmLoadBalancerMappings = null;
         vmLoadBalancerMappings = _lb2VmMapDao.listByLoadBalancerId(loadBalancerId);
+        if(vmLoadBalancerMappings == null) {
+            String msg = "no VM Loadbalancer Mapping found";
+            s_logger.error(msg);
+            throw new CloudRuntimeException(msg);
+        }
         Map<Long, String> vmServiceState = new HashMap<Long, String>(vmLoadBalancerMappings.size());
         List<Long> appliedInstanceIdList = new ArrayList<Long>();