ravening commented on a change in pull request #5723:
URL: https://github.com/apache/cloudstack/pull/5723#discussion_r759984688



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File path: 
server/src/main/java/com/cloud/network/element/VpcVirtualRouterElement.java
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@@ -348,6 +348,9 @@ public Provider getProvider() {
 
         //1st time it runs the domain router of the VM shall be returned
         List<DomainRouterVO> routers = super.getRouters(network, dest);
+        if (routers == null) {

Review comment:
       @weizhouapache `PlugNicAnswer` may not solve the issue. the NPE happens 
when the code tries to list the VR's for the network but it gets a null rather 
than empty list or list with size > 0




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