diff --git a/apps/wpm/scripts/batch_bxerp.py b/apps/wpm/scripts/batch_bxerp.py
index c06f7b4f..d198a6b7 100644
--- a/apps/wpm/scripts/batch_bxerp.py
+++ b/apps/wpm/scripts/batch_bxerp.py
@@ -90,6 +90,8 @@ def main(batch: str, mgroup_obj:Mgroup=None):
                     del old_data[item]
         else:
             old_data = {}
+    else:
+        old_data = {}
     old_data.update(data)
     batchst.data = old_data
     if batchst.first_time is None or (res["first_time"] and res["first_time"] < batchst.first_time):