diff --git a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServer56Resource.java b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServer56Resource.java
index a78ed819bde..a5a81a26ec9 100644
--- a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServer56Resource.java
+++ b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServer56Resource.java
@@ -26,6 +26,7 @@ import com.cloud.agent.api.NetworkUsageAnswer;
 import com.cloud.agent.api.NetworkUsageCommand;
 import com.cloud.agent.api.StartupCommand;
 import com.cloud.resource.ServerResource;
+import com.cloud.utils.ExecutionResult;
 import com.cloud.utils.exception.CloudRuntimeException;
 import com.cloud.utils.script.Script;
 import com.cloud.utils.ssh.SSHCmdHelper;
@@ -166,11 +167,15 @@ public class XenServer56Resource extends CitrixResourceBase {
                 return new NetworkUsageAnswer(cmd, "success", 0L, 0L);
             }
 
-            String result = executeInVR(cmd.getPrivateIP(), "vpc_netusage.sh", args).getDetails();
+            ExecutionResult result = executeInVR(cmd.getPrivateIP(), "vpc_netusage.sh", args);
+            String detail = result.getDetails();
+            if (!result.isSuccess()) {
+                throw new Exception(" vpc network usage plugin call failed ");
+            }
             if (option.equals("get") || option.equals("vpn")) {
                 long[] stats = new long[2];
-                if (result != null) {
-                    String[] splitResult = result.split(":");
+                if (detail != null) {
+                    String[] splitResult = detail.split(":");
                     int i = 0;
                     while (i < splitResult.length - 1) {
                         stats[0] += (new Long(splitResult[i++])).longValue();
@@ -179,9 +184,6 @@ public class XenServer56Resource extends CitrixResourceBase {
                     return new NetworkUsageAnswer(cmd, "success", stats[0], stats[1]);
                 }
             }
-            if (result == null || result.isEmpty()) {
-                throw new Exception(" vpc network usage plugin call failed ");
-            }
             return new NetworkUsageAnswer(cmd, "success", 0L, 0L);
         } catch (Exception ex) {
             s_logger.warn("Failed to get network usage stats due to ", ex);