diff --git a/hts/OrderChecker.py b/hts/OrderChecker.py
index 70ea944..5810d69 100644
--- a/hts/OrderChecker.py
+++ b/hts/OrderChecker.py
@@ -18,9 +18,10 @@ class OrderChecker:
         else:
             order_df = pd.DataFrame(columns=["stock_code", "type", "orderNum", "count", "price", "datetime"])
 
-        order_df = order_df.astype({"stock_code": str, "type": str, "orderNum": int, "count": int, "price": int})
         if 'Unnamed: 0' in order_df.columns:
             order_df.drop(['Unnamed: 0'], axis=1, inplace=True)
+        order_df = order_df.fillna(0)
+        order_df = order_df.astype({"stock_code": str, "type": str, "orderNum": int, "count": int, "price": int})
         order_df['datetime'] = pd.to_datetime(order_df['datetime'])
         return order_df