diff --git a/bt5/erp5_dms/SkinTemplateItem/portal_skins/erp5_dms/DMSFile_view/my_contributor_list.xml b/bt5/erp5_dms/SkinTemplateItem/portal_skins/erp5_dms/DMSFile_view/my_contributor_list.xml
index 4589ae34efed815bfadd6f6bb39b5ce6cec77b44..87a7869efccc226b9eb47302e49baa4d15260bcf 100644
--- a/bt5/erp5_dms/SkinTemplateItem/portal_skins/erp5_dms/DMSFile_view/my_contributor_list.xml
+++ b/bt5/erp5_dms/SkinTemplateItem/portal_skins/erp5_dms/DMSFile_view/my_contributor_list.xml
@@ -317,7 +317,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: here.getContributorTitleList()+here.getContributorNameList()</string> </value>
+            <value> <string>python: (here.getContributorTitleList() or [])+(here.getContributorNameList() or [])</string> </value>
         </item>
       </dictionary>
     </pickle>