diff --git a/nullptr/analyzer.py b/nullptr/analyzer.py
index 6e25ea8..9dd2b57 100644
--- a/nullptr/analyzer.py
+++ b/nullptr/analyzer.py
@@ -56,4 +56,4 @@ class Analyzer:
         if system is None: continue
         dest.add(SearchNode(system, o))
     if len(dest) == 0: return None
-    return  self.find_path(dest, to, depth-1, s)
+    return  self.find_path(dest, to, depth-1, seen)