diff --git a/jpndlpy/item_entity.py b/jpndlpy/item_entity.py
index 20b8173..5f41004 100644
--- a/jpndlpy/item_entity.py
+++ b/jpndlpy/item_entity.py
@@ -66,6 +66,8 @@ def extract_creator(self, item):
         creator_list = []
         if 'dc:creator' in item:
             creator_list = item['dc:creator']
+            if not creator_list:
+                return''
         else:
             return ''