diff --git a/server/src/com/cloud/configuration/ConfigurationManagerImpl.java b/server/src/com/cloud/configuration/ConfigurationManagerImpl.java
index bcd87da832a..bfa79a29dc2 100755
--- a/server/src/com/cloud/configuration/ConfigurationManagerImpl.java
+++ b/server/src/com/cloud/configuration/ConfigurationManagerImpl.java
@@ -407,7 +407,7 @@ public class ConfigurationManagerImpl extends ManagerBase implements Configurati
         String mgtCidr = _configDao.getValue(Config.ManagementNetwork.key());
         if (mgtCidr == null || mgtCidr.trim().isEmpty()) {
             String[] localCidrs = NetUtils.getLocalCidrs();
-            if (localCidrs.length > 0) {
+            if (localCidrs != null && (localCidrs.length > 0)) {
                 s_logger.warn("Management network CIDR is not configured originally. Set it default to " + localCidrs[0]);
 
                 _alertMgr.sendAlert(AlertManager.AlertType.ALERT_TYPE_MANAGMENT_NODE, 0, new Long(0), "Management network CIDR is not configured originally. Set it default to "