diff --git a/hbd/hbdclass.py b/hbd/hbdclass.py
index ed7e16d..5c9698e 100644
--- a/hbd/hbdclass.py
+++ b/hbd/hbdclass.py
@@ -221,7 +221,9 @@ class Host:
         for d in self.__dict__:
             if d == "connections":
                 cl = []
-                for c in self.connections:
+                for c in ["IPv4", "IPv6"]:
+                    if c not in self.connections:
+                        continue
                     # dirty ugly hack: fix conn to host backpointer
                     cld = copy.deepcopy(self.connections[c].__dict__)
                     cld["host"] = cld["host"].name