diff --git a/backend/app/services/future_service.py b/backend/app/services/future_service.py
index 7028dd1..9a7c4cd 100644
--- a/backend/app/services/future_service.py
+++ b/backend/app/services/future_service.py
@@ -89,7 +89,7 @@ class FutureService:
                 if adapter:
                     sdk_data = adapter.get_kline([code], start_date, end_date, "daily")
                     
-                    if code in sdk_data and not sdk_data[code].empty:
+                    if code in sdk_data and sdk_data[code] is not None and not sdk_data[code].empty:
                         self._save_daily_kline(code, sdk_data[code])
                         
                         cached_records = self.db.query(FutureKlineDaily).filter(
@@ -145,7 +145,7 @@ class FutureService:
                 if adapter:
                     sdk_data = adapter.get_kline([code], start_date, end_date, period)
                     
-                    if code in sdk_data and not sdk_data[code].empty:
+                    if code in sdk_data and sdk_data[code] is not None and not sdk_data[code].empty:
                         self._save_min_kline(code, sdk_data[code], period)
                         
                         cached_records = self.db.query(FutureKlineMin).filter(
diff --git a/backend/app/services/stock_service.py b/backend/app/services/stock_service.py
index 6096086..f9a88b0 100644
--- a/backend/app/services/stock_service.py
+++ b/backend/app/services/stock_service.py
@@ -95,7 +95,7 @@ class StockService:
                 if adapter:
                     sdk_data = adapter.get_kline([code], start_date, end_date, "daily")
                     
-                    if code in sdk_data and not sdk_data[code].empty:
+                    if code in sdk_data and sdk_data[code] is not None and not sdk_data[code].empty:
                         # 保存到数据库
                         self._save_daily_kline(code, sdk_data[code])
                         
@@ -154,7 +154,7 @@ class StockService:
                 if adapter:
                     sdk_data = adapter.get_kline([code], start_date, end_date, period)
                     
-                    if code in sdk_data and not sdk_data[code].empty:
+                    if code in sdk_data and sdk_data[code] is not None and not sdk_data[code].empty:
                         self._save_min_kline(code, sdk_data[code], period)
                         
                         # 重新查询