diff --git a/liteyuki/utils/base/data.py b/liteyuki/utils/base/data.py
index 3e5c93c..4ba03f4 100644
--- a/liteyuki/utils/base/data.py
+++ b/liteyuki/utils/base/data.py
@@ -155,7 +155,7 @@ class Database:
 
                 if field.startswith(self.BYTES_PREFIX):
 
-                    new_obj[field.replace(self.BYTES_PREFIX, "")] = self._load(pickle.loads(value))
+                    new_obj[field.replace(self.BYTES_PREFIX, "")] = self._load(pickle.loads(value) if value else value)     # 从value字段可能为None，fix at 2024/6/13
 
                 elif field.startswith(self.FOREIGN_KEY_PREFIX):