diff --git a/src/ParserInterface.cpp b/src/ParserInterface.cpp
index e715a62e2bf2..2677ac6c5a44 100644
--- a/src/ParserInterface.cpp
+++ b/src/ParserInterface.cpp
@@ -87,7 +87,7 @@ bool ParserInterface::processFlow(ParsedFlow *zflow) {
     zflow->vlan_id = rand() % SIMULATE_VLANS_MAX_VALUE;
 
 #ifdef NTOPNG_PRO
-  if(unique_source_id != 0) {
+  if((unique_source_id != 0) && (!isSubInterface())) {
     if (!flow_interfaces_stats->checkExporters(unique_source_id,
 					       zflow->inIndex, zflow->outIndex,
 					       zflow->exporter_device_ip, zflow->nprobe_ip)) {