diff --git a/minode/connection.py b/minode/connection.py
index 05d552a..e9f0b0d 100644
--- a/minode/connection.py
+++ b/minode/connection.py
@@ -411,6 +411,8 @@ class ConnectionBase(threading.Thread):
         addr = message.Addr.from_message(m)
         logging.debug('%s:%s -> %s', self.host_print, self.port, addr)
         for a in addr.addresses:
+            if not a.host or a.port == 0:
+                continue
             if (a.host, a.port) not in shared.core_nodes:
                 shared.unchecked_node_pool.add((a.host, a.port))