diff --git a/backend/crawler.py b/backend/crawler.py
index 992c457..c7d94dd 100644
--- a/backend/crawler.py
+++ b/backend/crawler.py
@@ -199,7 +199,7 @@ def convert_crawl(crawl):
             if path:
                 net.nodes[path[-1]]['prefixes'].add(prefix)
                 for path_asn in path:
-                    if path_asn not in (path[-1], path[0]):
+                    if path_asn in net.nodes and path_asn not in (path[-1], path[0]):
                         net.nodes[path_asn]['stub'] = False
 
     # add neighbor count