diff --git a/easyofd/parser_ofd/ofd_parser.py b/easyofd/parser_ofd/ofd_parser.py
index e86b3fe..38b1a9c 100644
--- a/easyofd/parser_ofd/ofd_parser.py
+++ b/easyofd/parser_ofd/ofd_parser.py
@@ -106,7 +106,8 @@ def img2data(self, imglist: List[ImageClass]):
 
     # 获得xml 对象
     def get_xml_obj(self, label):
-        assert label
+        if not label:
+            return ""
         # print(self.file_tree.keys())
         label =label.lstrip('./')
         for abs_p in self.file_tree: