--- versionedFile/versionedFile.py	2010/02/15 19:09:38	1.73
+++ versionedFile/versionedFile.py	2010/05/12 10:58:21	1.74
@@ -981,7 +981,7 @@ class versionedFile(CatalogAware,Folder)
         
         if str(self.REQUEST['AUTHENTICATED_USER']) in ["Anonymous User"]:
             return "please login first"
-        if (self.lockedBy==self.REQUEST['AUTHENTICATED_USER']) or (self.lockedBy==''):
+        if (self.lockedBy==self.REQUEST['AUTHENTICATED_USER']) or (self.lockedBy=='') or (self.lockedBy==None):
             ext=self.ZopeFind(self.aq_parent,obj_ids=["addNewVersion.dtml"])
             if ext:
                 return ext[0][1]('',globals(),version=self.getVersion(),lastComment=self.getLastVersion().getVersionComment(),AUTHENTICATED_USER=self.REQUEST.AUTHENTICATED_USER)