diff --git a/db_logic/medicament.py b/db_logic/medicament.py
index 846a1c1..03a94a0 100644
--- a/db_logic/medicament.py
+++ b/db_logic/medicament.py
@@ -356,7 +356,7 @@ class BllMedicament(Repository):
                 price=entityDrug.price,
                 record_type=DrugRecordType.Use,
                 is_empty=0,
-                record_remain=float(entityDrug.remain),
+                record_remain=float(entityDrug.remain) if entityDrug.remain else 0,
                 create_date=Utils.get_str_datetime(),
                 create_user_id=entityUser.user_id,
                 create_user_name=entityUser.real_name,