diff --git a/lbrynet/core/StreamCreator.py b/lbrynet/core/StreamCreator.py
index 3b7877f91..5093651be 100644
--- a/lbrynet/core/StreamCreator.py
+++ b/lbrynet/core/StreamCreator.py
@@ -27,7 +27,7 @@ class StreamCreator(object):
         self.finished_deferreds = []
 
     def _blob_finished(self, blob_info):
-        pass
+        raise NotImplementedError()
 
     def registerProducer(self, producer, streaming):