diff --git a/lxc_net/parse_network.py b/lxc_net/parse_network.py
index 674299d..9dc3d5f 100644
--- a/lxc_net/parse_network.py
+++ b/lxc_net/parse_network.py
@@ -49,7 +49,7 @@ class YamlTopology:
                     dom_descr[dom] = {"links": []}
                 dom_descr[dom]["links"].append(cur_link)
 
-        for dom_conf_name in topology.get("domains", None):
+        for dom_conf_name in topology.get("domains", {}):
             if dom_conf_name not in dom_descr:
                 # Domain does not participate in any link: warn and ignore
                 print(