diff --git a/gns3server/controller/topology.py b/gns3server/controller/topology.py
index ae156289e..9cc7a6399 100644
--- a/gns3server/controller/topology.py
+++ b/gns3server/controller/topology.py
@@ -266,7 +266,7 @@ def _convert_1_3_later(topo, topo_path):
 
         destination_node = {
             "adapter_number": ports[old_link["destination_port_id"]].get("adapter_number", 0),
-            "port_number": ports[old_link["destination_port_id"]]["port_number"],
+            "port_number": ports[old_link["destination_port_id"]].get("port_number", 0),
             "node_id": node_id_to_node_uuid[old_link["destination_node_id"]]
         }
         nodes.append(destination_node)