diff --git a/models/rank/fm/data/get_slot_data.py b/models/rank/fm/data/get_slot_data.py
index f0b95a79c70d7c9da8b327884c17206e6b76f731..0f0c217d0be374f66cfb3a7445abbff35183e019 100644
--- a/models/rank/fm/data/get_slot_data.py
+++ b/models/rank/fm/data/get_slot_data.py
@@ -80,7 +80,6 @@ class Reader(dg.MultiSlotDataGenerator):
                 for j in v:
                     s += " " + k + ":" + str(j)
             print(s.strip())
-            yield None
 
         return data_iter
 
diff --git a/models/rank/fm/readme.md b/models/rank/fm/readme.md
index e2284faff4d051988eb94267c9dcdfc5bb30c436..8070671275a48184c6d68a9783796c6600935433 100644
--- a/models/rank/fm/readme.md
+++ b/models/rank/fm/readme.md
@@ -152,7 +152,6 @@ class Reader(dg.MultiSlotDataGenerator):
                 for j in v:
                     s += " " + k + ":" + str(j)
             print(s.strip())
-            yield None
         return data_iter
 reader = Reader(
     "../config.yaml")  # run this file in original folder to find config.yaml