diff --git a/src/NetworkInterface.cpp b/src/NetworkInterface.cpp
index c0d56c714b..7513b8810d 100644
--- a/src/NetworkInterface.cpp
+++ b/src/NetworkInterface.cpp
@@ -1032,11 +1032,11 @@ NetworkInterface* NetworkInterface::getSubInterface(u_int32_t criteria, bool par
 	  h->iface = new NetworkInterface(buf, vIface_type);
 
 	if(h->iface) {
-	  h->iface->allocateNetworkStats();
-	  HASH_ADD_INT(flowHashing, criteria, h);
 	  ntop->registerInterface(h->iface);
-	  numVirtualInterfaces++;
+	  h->iface->allocateNetworkStats();
 	  h->iface->setDynamicInterface();
+	  HASH_ADD_INT(flowHashing, criteria, h);
+	  numVirtualInterfaces++;
 	}
       } else
 	ntop->getTrace()->traceEvent(TRACE_WARNING, "Not enough memory");
diff --git a/src/Ntop.cpp b/src/Ntop.cpp
index 7c0b15a530..39f114f2c5 100644
--- a/src/Ntop.cpp
+++ b/src/Ntop.cpp
@@ -1492,7 +1492,7 @@ void Ntop::setLocalNetworks(char *_nets) {
 
 NetworkInterface* Ntop::getInterfaceById(int if_id) {
   for(int i=0; i<num_defined_interfaces; i++) {
-    if(iface[i]->get_id() == if_id)
+    if(iface[i] && iface[i]->get_id() == if_id)
       return(iface[i]);
   }