diff --git a/oyster/core.py b/oyster/core.py
index 9ff7072..3ad4ba1 100644
--- a/oyster/core.py
+++ b/oyster/core.py
@@ -104,8 +104,7 @@ class Kernel(object):
 
         if id:
             tracked = self.db.tracked.find_one({'_id': id})
-
-        if not tracked:
+        else:
             tracked = self.db.tracked.find_one({'url': url})
 
         # if id exists, ensure that URL and doc_class haven't changed