diff --git a/engine/orchestration/src/main/java/org/apache/cloudstack/engine/orchestration/NetworkOrchestrator.java b/engine/orchestration/src/main/java/org/apache/cloudstack/engine/orchestration/NetworkOrchestrator.java
index 804775a3614..5cf195ea0b9 100644
--- a/engine/orchestration/src/main/java/org/apache/cloudstack/engine/orchestration/NetworkOrchestrator.java
+++ b/engine/orchestration/src/main/java/org/apache/cloudstack/engine/orchestration/NetworkOrchestrator.java
@@ -2532,7 +2532,7 @@ public class NetworkOrchestrator extends ManagerBase implements NetworkOrchestra
             throw new InvalidParameterValueException(String.format("Failed to encode VLAN/VXLAN %s into a Broadcast URI. Physical Network cannot be null.", vlanId));
         }
 
-        if(StringUtils.isNotBlank(pNtwk.getIsolationMethods().get(0))) {
+        if(!pNtwk.getIsolationMethods().isEmpty() && StringUtils.isNotBlank(pNtwk.getIsolationMethods().get(0))) {
             String isolationMethod = pNtwk.getIsolationMethods().get(0).toLowerCase();
             String vxlan = BroadcastDomainType.Vxlan.toString().toLowerCase();
             if(isolationMethod.equals(vxlan)) {